KINDAI UNIVERSITY


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KASAMATSU Kenichi

Profile

FacultyDepartment of Science / Graduate School of Science and Engineering Research
PositionAssociate Professor
DegreePhD (Science)
Commentator Guidehttps://www.kindai.ac.jp/meikan/299-kasamatsu-kenichi.html
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Last Updated :2020/04/03

Education and Career

Education

  •   1995 04  - 1999 03 , Osaka City University, Faculty of Science
  •   1999 04  - 2004 03 , Osaka City University

Academic & Professional Experience

  •   2013 04 ,  - 現在, Associate Professor, Dept. of Phys., Kinki Univ.
  •   2008 04 ,  - 2013 03 , Lecturer, Dept. of Phys. Kinki Univ.
  •   2005 04 ,  - 2008 03 , Lecturer, Ishikawa National college of Technology

Research Activities

Research Areas

  • Natural sciences, Semiconductors, optical and atomic physics
  • Natural sciences, Magnetism, superconductivity, and strongly correlated systems

Published Papers

  • Transverse instability and disintegration of domain wall of relative phase in coherently coupled two-component Bose-Einstein condensates, Kousuke Ihara, Kenichi Kasamatsu, Phys. Rev. A 100, 013630 (2019), Phys. Rev. A 100, 013630 (2019), Apr. 2019 , Refereed
    Summary:We study transverse instability and disintegration dynamics of a domain wall
    of a relative phase in two-component Bose-Einstein condensates with a coherent
    Rabi coupling. We obtain analytically the stability phase diagram of the
    stationary solution of the domain wall for the one-dimensional coupled
    Gross-Pitaevskii equations in the plane of the Rabi frequency and the
    intercomponent coupling constant. Outside the stable region, the domain wall is
    dynamically unstable for the transverse modulation along the direction
    perpendicular to the phase kink. The nonlinear evolution associated with the
    instability is demonstrated through numerical simulations for both the domain
    wall without edges and that with edges formed by the quantized vortices.
  • Effects of a magnetic field on vortex states in superfluid He-3-B, Kasamatsu Kenichi, Mizuno Ryota, Ohmi Tetsuo, Nakahara Mikio, PHYSICAL REVIEW B, PHYSICAL REVIEW B, 99(10), Mar. 18 2019 , Refereed
  • Modulation instability associated nonlinear dynamics of spin-orbit coupled Bose - Einstein condensates, Mithun Thudiyangal, Kasamatsu Kenichi, JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 52(4), Feb. 28 2019 , Refereed
  • Stripes and honeycomb lattice of quantized vortices in rotating two-component Bose-Einstein condensates, Kasamatsu Kenichi, Sakashita Kouhei, PHYSICAL REVIEW A, PHYSICAL REVIEW A, 97(5), May 29 2018 , Refereed
  • Is a Doubly Quantized Vortex Dynamically Unstable in Uniform Superfluids?, Takeuchi Hiromitsu, Kobayashi Michikazu, Kasamatsu Kenichi, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 87(2), Feb. 2018 , Refereed
  • Quantum simulation of (1 + 1)-dimensional U(1) gauge-Higgs model on a lattice by cold Bose gases, Yoshihito Kuno, Shinya Sakane, Kenichi Kasamatsu, Ikuo Ichinose, Tetsuo Matsui, Physical Review D, Physical Review D, 95(9), May 16 2017 , Refereed
  • Atomic quantum simulation of a three-dimensional U(1) gauge-Higgs model, Kuno Yoshihito, Sakane Shinya, Kasamatsu Kenichi, Ichinose Ikuo, Matsui Tetsuo, PHYSICAL REVIEW A, PHYSICAL REVIEW A, 94(6), Dec. 27 2016 , Refereed
  • Short-range intervortex interaction and interacting dynamics of half-quantized vortices in two-component Bose-Einstein condensates, Kasamatsu Kenichi, Eto Minoru, Nitta Muneto, PHYSICAL REVIEW A, PHYSICAL REVIEW A, 93(1), Jan. 19 2016 , Refereed
  • Dynamics of quantized vortices in Bose-Einstein condensates with laser-induced spin-orbit coupling, Kasamatsu Kenichi, PHYSICAL REVIEW A, PHYSICAL REVIEW A, 92(6), Dec. 03 2015 , Refereed
  • Real-time dynamics and proposal for feasible experiments of lattice gauge-Higgs model simulated by cold atoms, Kuno Yoshihito, Kasamatsu Kenichi, Takahashi Yoshiro, Ichinose Ikuo, Matsui Tetsuo, NEW JOURNAL OF PHYSICS, NEW JOURNAL OF PHYSICS, 17, Jun. 04 2015 , Refereed
  • Nambu-Goldstone Modes in Segregated Bose-Einstein Condensates, Hiromitsu Takeuchi, Kenichi Kasamatsu, Sep. 13 2013
    Summary:Nambu-Goldstone modes in immiscible two-component Bose-Einstein condensates
    are studied theoretically. In a uniform system, a flat domain wall is
    stabilized and then the translational invariance normal to the wall is
    spontaneously broken in addition to the breaking of two U(1) symmetries in the
    presence of two complex order parameters. We clarify properties of the
    low-energy excitations and identify that there exist two Nambu-Goldstone modes:
    in-phase phonon with a linear dispersion and ripplon with a fractional
    dispersion. The signature of the characteristic dispersion can be verified in
    s...
  • D-brane solitons and boojums in field theory and Bose-Einstein condensates, Kenichi Kasamatsu, Hiromitsu Takeuchi, Muneto Nitta, J.Phys.Condens.Matter, J.Phys.Condens.Matter, 25, 404213-1 - 14, Sep. 2013 , Refereed
    Summary:In certain field theoretical models, composite solitons consisting of a
    domain wall and vortex lines attached to the wall have been referred to as
    D-brane solitons. We show that similar composite solitons can be realized in
    phase-separated two-component Bose-Einstein condensates. We discuss the
    similarities and differences between topological solitons in the Abelian-Higgs
    model and those in two-component Bose-Einstein condensates. Based on the
    formulation of gauge theory, we introduce the "boojum charge" to characterize
    the "D-brane soliton" in Bose-Einstein condensates.
  • Atomic Quantum Simulation of Lattice Gauge-Higgs Model: Higgs Couplings and Emergence of Exact Local Gauge Symmetry, Kenichi Kasamatsu, Ikuo Ichinose, Tetsuo Matsui, Phys. Rev. Lett., Phys. Rev. Lett., 111(11), 115303-1 - 5, Sep. 2013 , Refereed
    Summary:Recently, the possibility of quantum simulation of dynamical gauge fields was
    pointed out by using a system of cold atoms trapped on each link in an optical
    lattice. However, to implement exact local gauge invariance, fine-tuning the
    interaction parameters among atoms is necessary. In the present paper, we study
    the effect of violation of the U(1) local gauge invariance by relaxing the
    fine-tuning of the parameters and showing that a wide variety of cold atoms is
    still to be a faithful quantum simulator for a U(1) gauge-Higgs model
    containing a Higgs field sitting on sites. Clarification of...
  • Wall-vortex composite solitons in two-component Bose-Einstein condensates, Kenichi Kasamatsu, Hiromitsu Takeuchi, Makoto Tsubota, Muneto Nitta, Phys. Rev. A, Phys. Rev. A, 88(1), 013620-1 - 14, Jul. 2013 , Refereed
    Summary:We study composite solitons, consisting of domain walls and vortex lines
    attaching to the walls in two-component Bose-Einstein condensates. When the
    total density of two components is homogeneous, the system can be mapped to the
    O(3) nonlinear sigma model for the pseudospin representing the two-component
    order parameter and the analytical solutions of the composite solitons can be
    obtained. Based on the analytical solutions, we discuss the detailed structure
    of the composite solitons in two-component condensates by employing the
    generalized nonlinear sigma model, where all degrees of freedo...
  • Vortex Formations from Domain Wall Annihilations in Two-Component Bose-Einstein Condensates (vol 162, pg 243, 2011), Takeuchi Hiromitsu, Kasamatsu Kenichi, Nitta Muneto, Tsubota Makoto, JOURNAL OF LOW TEMPERATURE PHYSICS, JOURNAL OF LOW TEMPERATURE PHYSICS, 171(1-2), 156, Apr. 2013 , Refereed
  • IMPLEMENTATION OF A SELECTIVE TWO-QUBIT GATE OPERATION IN A NEUTRAL ATOM QUANTUM COMPUTER, Lapasar Elham Hosseini, Kasamatsu Kenichi, Kondo Yasushi, Nakahara Mikio, Ohmi Tetsuo, QUANTUM INFORMATION AND QUANTUM COMPUTING, QUANTUM INFORMATION AND QUANTUM COMPUTING, 6, 43 - 49, 2013 , Refereed
  • BOSONS IN AN OPTICAL LATTICE WITH A SYNTHETIC MAGNETIC FIELD, Kasamatsu Kenichi, INTERFACE BETWEEN QUANTUM INFORMATION AND STATISTICAL PHYSICS, INTERFACE BETWEEN QUANTUM INFORMATION AND STATISTICAL PHYSICS, 7, 3 - 35, 2013 , Refereed
  • Tachyon Condensation Due to Domain-Wall Annihilation in Bose-Einstein Condensates, Hiromitsu Takeuchi, Kenichi Kasamatsu, Makoto Tsubota, Muneto Nitta, Phys. Rev. Lett., Phys. Rev. Lett., 109(24), 245301-1 - 5, Dec. 2012 , Refereed
    Summary:We show theoretically that a domain-wall annihilation in two-component
    Bose-Einstein condensates causes tachyon condensation accompanied by
    spontaneous symmetry breaking in a two-dimensional subspace. Three-dimensional
    vortex formation from domain-wall annihilations is considered a kink formation
    in subspace. Numerical experiments reveal that the subspatial dynamics obey the
    dynamic scaling law of phase-ordering kinetics. This model is experimentally
    feasible and provides insights into how the extra dimensions influence
    subspatial phase transition in higher-dimensional space.
  • Creating vortons and three-dimensional skyrmions from domain wall annihilation with stretched vortices in Bose-Einstein condensates, Muneto Nitta, Kenichi Kasamatsu, Makoto Tsubota, Hiromitsu Takeuchi, Phys. Rev. A, Phys. Rev. A, 85(5), 053639-1 - 11, May 2012 , Refereed
    Summary:We propose a mechanism to create a vorton or three-dimensional skyrmion in
    phase-separated two-component BECs with the order parameters Psi_1 and Psi_2 of
    the two condensates. We consider a pair of a domain wall (brane) and an
    anti-domain wall (anti-brane) stretched by vortices (strings), where the Psi_2
    component with a vortex winding is sandwiched by two domains of the Psi_1
    component. The vortons appear when the domain wall pair annihilates.
    Experimentally, this can be realized by preparing the phase separation in the
    order Psi_1, Psi_2 and Psi_1 components, where the nodal plane of a da...
  • Finite-temperature phase structures of hard-core bosons in an optical lattice with an effective magnetic field, Yuki Nakano, Kenichi Kasamatsu, Tetsuo Matsui, Phys. Rev. A, Phys. Rev. A, 85(2), 023622-1 - 11, Feb. 2012 , Refereed
    Summary:We study finite-temperature phase structures of hard-core bosons in a
    two-dimensional optical lattice subject to an effective magnetic field by
    employing the gauged CP$^1$ model. Based on the extensive Monte Carlo
    simulations, we study their phase structures at finite temperatures for several
    values of the magnetic flux per plaquette of the lattice and mean particle
    density. Despite the presence of the particle number fluctuation, the
    thermodynamic properties are qualitatively similar to those of the frustrated
    XY model with only the phase as a dynamical variable. This suggests that cold
    at...
  • Vortex formation of a Bose-Einstein condensate in a rotating deep optical lattice, Akira Kato, Yuki Nakano, Kenichi Kasamatsu, Tetsuo Matsui, Phys. Rev. A 84, 053623 (2011), Phys. Rev. A 84, 053623 (2011), 84(5), 053623-1 - 6, Nov. 2011 , Refereed
    Summary:We study the dynamics of vortex nucleation and lattice formation in a
    Bose--Einstein condensate in a rotating square optical lattice by numerical
    simulations of the Gross--Pitaevskii equation. Different dynamical regimes of
    vortex nucleation are found, depending on the depth and period of the optical
    lattice. We make an extensive comparison with the experiments by Williams {\it
    et al.} [Phys. Rev. Lett. {\bf 104}, 050404 (2010)], especially focusing on the
    issues of the critical rotation frequency for the first vortex nucleation and
    the vortex number as a function of rotation frequency.
  • Scalable Neutral Atom Quantum Computer with Interaction on Demand: Proposal for Selective Application of Two-Qubit Gate, Elham Hosseini Lapasar, Kenichi Kasamatsu, Yasushi Kondo, Mikio Nakahara, Tetsuo Ohmi, J. Phys. Soc. Jpn., J. Phys. Soc. Jpn., 80, 114003-1 - 10, Aug. 2011 , Refereed
    Summary:We propose a scalable neutral atom quantum computer with an on-demand
    interaction through a selective two-qubit gate operation. Atoms are trapped by
    a lattice of near field Fresnel diffraction lights so that each trap captures a
    single atom. One-qubit gate operation is implemented by a gate control laser
    beam which is applied to an individual atom. Two-qubit gate operation between
    an arbitrary pair of atoms is implemented by sending these atoms to a
    state-dependent optical lattice and making them collide so that a particular
    two-qubit state acquires a dynamical phase. We give numerical eval...
  • Route to turbulence in a trapped Bose-Einstein condensate, J. A. Seman, E. A. L. Henn, R. F. Shiozaki, G. Roati, F. J. Poveda-Cuevas, K. M, F. Magalhães, V. I. Yukalov, M. Tsubota, M. Kobayashi, K. Kasamatsu, V. S. Bagnato, Laser Physics Letters, Laser Physics Letters, 8(9), 691 - 696, Jul. 2011 , Refereed
    Summary:We have studied a Bose-Einstein condensate of $^{87}Rb$ atoms under an oscillatory excitation. For a fixed frequency of excitation, we have explored how the values of amplitude and time of excitation must be combined in order to produce quantum turbulence in the condensate. Depending on the combination of these parameters different behaviors are observed in the sample. For the lowest values of time and amplitude of excitation, we observe a bending of the main axis of the cloud. Increasing the amplitude of excitation we observe an increasing number of vortices. The vortex state can evolve into the turbulent regime if the parameters of excitation are driven up to a certain set of combinations. If the value of the parameters of these combinations is exceeded, all vorticity disappears and the condensate enters into a different regime which we have identified as the granular phase. Our results are summarized in a diagram of amplitude versus time of excitation in which the different structures can be identified. We also present numerical simulations of the Gross-Pitaevskii equation which support our observations.
  • Interaction of half-quantized vortices in two-component Bose-Einstein condensates, Minoru Eto, Kenichi Kasamatsu, Muneto Nitta, Hiromitsu Takeuchi, Makoto Tsubota, Phys.Rev.A, Phys.Rev.A, 83(6), 063603-1 - 8, Jun. 2011 , Refereed
    Summary:We study the asymptotic interaction between two half-quantized vortices in
    two-component Bose-Einstein condensates. When two vortices in different
    components are placed at distance 2R, the leading order of the force between
    them is found to be (log R/\xi-1/2)/R^3, in contrast to 1/R between vortices
    placed in the same component. We derive it analytically using the Abrikosov
    ansatz and the profile functions of the vortices, confirmed numerically with
    the Gross-Pitaevskii model. We also find that the short-range cutoff of the
    inter-vortex potential linearly depends on the healing length.
  • Crossover between Kelvin-Helmholtz and counter-superflow instabilities in two-component Bose-Einstein condensates, Naoya Suzuki, Hiromitsu Takeuchi, Kenichi Kasamatsu, Makoto Tsubota, Hiroki Saito, Phys. Rev. A, Phys. Rev. A, 82(6), 063604-1 - 9, Dec. 2010 , Refereed
    Summary:Dynamical instabilities at the interface between two Bose--Einstein
    condensates that are moving relative to each other are investigated using
    mean-field and Bogoliubov analyses. Kelvin--Helmholtz instability is dominant
    when the interface thickness is much smaller than the wavelength of the
    unstable interface mode, whereas the counter-superflow instability becomes
    dominant in the opposite case. These instabilities emerge not only in an
    immiscible system but also in a miscible system where an interface is produced
    by external potential. Dynamics caused by these instabilities are numerically
    ...
  • Analogues of D-branes in Bose-Einstein condensates, Kenichi Kasamatsu, Hiromitsu Takeuchi, Muneto Nitta, Makoto Tsubota, Journal of high energy physics, Journal of high energy physics, 11(068), 1 - 11, Nov. 2010 , Refereed
    Summary:We demonstrate theoretically that analogues of D-branes in string theory can
    be realized in rotating, phase-separated, two-component Bose-Einstein
    condensates and that they are observable using current experimental techniques.
    This study raises the possibility of simulating D-branes in the laboratory.
  • Quantum Kelvin-Helmholtz instability in phase-separated two-component Bose-Einstein condensates, Hiromitsu Takeuchi, Naoya Suzuki, Kenichi Kasamatsu, Hiroki Saito, Makoto Tsubota, Phys. Rev. B, Phys. Rev. B, 81(9), 094517-1 - 5, Mar. 2010 , Refereed
  • Shear-flow Instability in Two-component Bose-Einstein condensates, Journal of Low Temperature Physics, Journal of Low Temperature Physics, 158(3/4), 384 - 390, Feb. 2010
  • Connection of Vortices Between Spatially Different Phases in Two-Component Bose-Einstein Condensates, Kasamatsu Kenichi, Takeuchi Hiromitsu, Nitta Muneto, Tsubota Makoto, Journal of Low Temperature Physics, Journal of Low Temperature Physics, 158(1/2), 99 - 104, Jan. 2010 , Refereed
  • Uniformly frustrated Josephson junction array in trapped Bose-Einstein condensates, Journal of Physics: Conference series150, 032038 (2009), Journal of Physics: Conference series150, 032038 (2009), Mar. 2009
  • Spontaneous radiation and amplification of Kelvin waves on quantized vortices in Bose-Einstein condensates, Hiromitsu Takeuchi, Kenichi Kasamatsu, Makoto Tsubota, Phys. Rev. A, Phys. Rev. A, 79(3), 033619-1 - 5, Mar. 2009 , Refereed
  • Uniformly frustrated bosonic Josephson-junction arrays, Kenichi Kasamatsu, Phys. Rev. A, Phys. Rev. A, 79(2), 021604(R)-1 - 4, Feb. 2009 , Refereed
  • Vortex sheet in rotating two-component Bose-Einstein condensates, Kenichi Kasamatsu, Makoto Tsubota, Phys. Rev. A, Phys. Rev. A, 79(2), 023606-1 - 7, Feb. 2009 , Refereed
  • Static and dynamic properties of multicomponent Bose-Einstein condensates of ytterbium atoms, Kasamatsu Kenichi, Tsubota Makoto, JOURNAL OF LOW TEMPERATURE PHYSICS, JOURNAL OF LOW TEMPERATURE PHYSICS, 150(3-4), 599 - 604, Feb. 2008 , Refereed
  • Vortex lattices in rotating Bose-Einstein condensate in an optical lattice: Analogy to uniformly frustrated Josephson-junction arrays, Kasamatsu Kenichi, JOURNAL OF LOW TEMPERATURE PHYSICS, JOURNAL OF LOW TEMPERATURE PHYSICS, 150(3-4), 593 - 598, Feb. 2008 , Refereed
  • Dynamical properties of vortices in a Bose-Einstein condensate in a rotating lattice, Kasamatsu Kenichi, Tsubota Makoto, JOURNAL OF LOW TEMPERATURE PHYSICS, JOURNAL OF LOW TEMPERATURE PHYSICS, 148(3-4), 357 - 361, Aug. 2007 , Refereed
  • Dynamical Vortex Phases in a Bose-Einstein Condensate driven by a rotating optical lattice, Kenichi Kasamatsu, Makoto Tsubota, Phys. Rev. Lett., Phys. Rev. Lett., 97(24), 240404-1 - 4, Dec. 15 2006 , Refereed
    Summary:We present simulation results of the vortex dynamics in a trapped
    Bose-Einstein condensate in the presence of a rotating optical lattice.
    Changing the potential amplitude and the relative rotation frequency between
    the condensate and the optical lattice, we find a rich variety of dynamical
    phases of vortices. The onset of these different phases is described by the
    force balance of a driving force, a pinning force and vortex-vortex
    interactions. In particular, when the optical lattice rotates faster than the
    condensate, an incommensurate effect leads to a vortex liquid phase supported
    by the...
  • Modulation instability and solitary wave formation in two-component Bose-Einstein condensates, Kenichi Kasamatsu, Makoto Tsubota, Phys. Rev. A, Phys. Rev. A, 74(1), 013617-1 - 14, Jul. 2006 , Refereed
    Summary:We investigate nonlinear dynamics induced by the modulation instability of a
    two-component mixture in an atomic Bose-Einstein condensate. The nonlinear
    dynamics is examined using numerical simulations of the time-dependent coupled
    Gross-Pitaevskii equations. The unstable modulation grows from initially
    miscible condensates into various types of vector solitary waves, depending on
    the combinations of the sign of the coupling constants (intracomponent and
    intercomponent). We discuss the detailed features of the modulation
    instability, dynamics of solitary wave formation, and an analogy with t...
  • Vortex structures in rotating two-component Bose-Einstein condensates in an anharmonic trapping potential, Takeuchi Hiromitsu, Kasamatsu Kenichi, Tsubota Makoto, LOW TEMPERATURE PHYSICS, PTS A AND B, LOW TEMPERATURE PHYSICS, PTS A AND B, 850, 57 - +, 2006 , Refereed
  • Three-dimensional dynamics of vortex lattice formation in Bose-Einstein condensates, Kenichi Kasamatsu, Masahiko Machida, Narimasa Sasa, Makoto Tsubota, Phys. Rev. A, Phys. Rev. A, 71(6), 063616-1 - 5, Jun. 2005 , Refereed
  • Vortices in multicomponent Bose-Einstein condensates, Kenichi Kasamatsu, Makoto Tsubota, Masahito Ueda, Int. J. Mod. Phys. B, Int. J. Mod. Phys. B, 19(11), 1835 - 1904, Apr. 2005
  • Spin textures in rotating two-component Bose-Einstein condensates, Kenichi Kasamatsu, Makoto Tsubota, Masahito Ueda, Phys. Rev. A, Phys. Rev. A, 71(4), 043611-1 - 14, Apr. 2005 , Refereed
  • Vortex Molecules in Coherently Coupled Two-Component Bose-Einstein Condensates, Kenichi Kasamatsu, Makoto Tsubota, Masahito Ueda, Phys. Rev. Lett., Phys. Rev. Lett., 93(25), 250406-1 - 4, Dec. 2004 , Refereed
  • Multiple domain formation induced by modulation instability in two-component Bose-Einstein condensates, Kenichi Kasamatsu, Makoto Tsubota, Phys. Rev. Lett., Phys. Rev. Lett., 93(10), 100402-1 - 4, Sep. 2004 , Refereed
    Summary:The dynamics of multiple domain formation caused by the modulation
    instability of two-component Bose-Einstein condensates in an axially symmetric
    trap are studied by numerically integrating the coupled Gross-Pitaevskii
    equations. The modulation instability induced by the intercomponent mean-field
    coupling occurs in the out-of-phase fluctuation of the wave function and leads
    to the formation of multiple domains that alternate from one domain to another,
    where the phase of one component jumps across the density dips where the
    domains of the other exist. This behavior is analogous to a soliton...
  • Quadrupole and scissors modes and nonlinear mode coupling in trapped two-component Bose-Einstein condensates, Kenichi Kasamatsu, Makoto Tsubota, Masahito Ueda, Phys. Rev. A, Phys. Rev. A, 69(4), 043621-1 - 10, Apr. 2004 , Refereed
  • Vortex Phase Diagram in Rotating Two-Component Bose-Einstein Condensates, Kenichi Kasamatsu, Makoto Tsubota, Masahito Ueda, Phys. Rev. Lett., Phys. Rev. Lett., 91(15), 150406-1 - 4, Oct. 2003 , Refereed
  • Nonlinear dynamics of vortex lattice formation in a rotating Bose-Einstein condensate, Kenichi Kasamatsu, Makoto Tsubota, Masahito Ueda, Phys. Rev. A, Phys. Rev. A, 67(3), 033610-1 - 14, Mar. 2003 , Refereed
  • Dynamics of quantized vortices in superfluid helium and rotating Bose-Einstein condensates, Makoto Tsubota, Kenichi Kasamatsu, Tsunehiko Araki, Recent Res. Devel. Physics, Recent Res. Devel. Physics, 4, 631 - 655, 2003
  • Giant hole and circular superflow in a fast rotating Bose-Einstein condensate, Kenichi Kasamatsu, Makoto Tsubota, Masahito Ueda, Phys. Rev. A, Phys. Rev. A, 66(5), 053606-1 - 4, Nov. 2002 , Refereed
  • Vortex lattice formation in a rotating Bose-Einstein condensate, Makoto Tsubota, Kenichi Kasamatsu, Masahito Ueda, Phys. Rev. A, Phys. Rev. A, 65(2), 023603-1 - 4, Jan. 2002 , Refereed
  • Macroscopic quantum tunneling of two-component Bose-Einstein condensates, Kenichi Kasamatsu, Yukinori Yasui, Makoto Tsubota, Phys. Rev. A, Phys. Rev. A, 64(5), 053605-1 - 11, Oct. 2001 , Refereed
  • Josephson Current Flowing in Cyclically Coupled Bose-Einstein Condensates, Makoto Tsubota, Kenichi Kasamatsu, J. Phys. Soc. Jpn, J. Phys. Soc. Jpn, 69(7), 1942 - 1945, Jul. 2000
    Summary:The Josephson effect in cyclically coupled Bose-Einstein condensates is
    studied theoretically. We analyze the simultaneous Gross-Pitaevskii equations
    with coupling terms between adjacent condensates. Depending on the initial
    relative phases between condensates, Josephson current flows cyclically to make
    a quantized vortex. Reducing the coupling between condensates changes the
    motion from periodic to chaotic, thus suppressing the cyclic current. The
    relation to the Kibble-Zurek mechanism is discussed.

Books etc

  • Physics of Quantum fluids: New Trends and Hot Topics in Atomic and Polariton Condensates, Quantized vortices and quantum turbulence, 共著, Springer,   2013 07
  • Novel Superfluids, KASAMATSU Kenichi, 分担執筆, Chap. 2, pp.156-252: Quantized vortices in superfluid helium and atomic Bose-Einstein condensates, Oxford Univ. Press,   2013 01
  • Progress in Low Temperature Physics, Volume 16: Quantum Turbulence, Bill Halperin, Makoto Tsubota, 分担執筆, Chap. 7, pp.351-404: Quantized vortices in atomic Bose-Einstein condensates, Elsevier Science,   2008 12 , 0080548105

Conference Activities & Talks

  • ラビ結合した2成分ボース凝縮体のドメインウォールの不安定化, 井原康輔, 笠松健一, 日本物理学会講演概要集(CD-ROM),   2019 03 22
  • 有限磁場下における超流動3He‐B相の渦芯構造と相図 II―横磁場の場合―, 笠松健一, 大見哲巨, 中原幹夫, 日本物理学会講演概要集(CD-ROM),   2019 03 22
  • 光格子中の一次元Bose気体におけるダークソリトンの準古典ダイナミクス, 尾崎裕介, 長尾一馬, 段下一平, 笠松健一, 日本物理学会講演概要集(CD-ROM),   2019 03 22
  • 有限磁場下における超流動3He‐B相の渦芯構造と相図, 笠松健一, 大見哲巨, 中原幹夫, 日本物理学会講演概要集(CD-ROM),   2018 03 23
  • 巻き数2の量子渦は動的に安定か?, 竹内宏光, 小林未知数, 笠松健一, 日本物理学会講演概要集(CD-ROM),   2018 03 23
  • Anomalous diffusion and quasi many-body localization in polar lattice gases, Kasamatsu K, Barbiero Luca, Menotti Chiara, Recati Alessio, Santos Luis, Meeting Abstracts of the Physical Society of Japan,   2016 09 23
    Summary:

    1次元光格子中の長l距離相互作用をもつハードコアボソンにおいて、粒子のランダムな初期配置から一様粒子分布の平衡状態への緩和の非平衡ダイナミクスをボースハバード模型の厳密な時間発展を用いて調べた。長距離相互作用の強さが増すにつれ、緩和時間が異常に長くなる事を見いだした。この微視的な原因を考察し、多体局在との関連性を議論する。

  • 3D Extended Bose Hubbard Model and U(1) Lattice Gauge Higgs Model, Kuno Yoshito, Sakane Shinya, Kasamatsu Kenichi, Ichinose Ikuo, Matsui Tetsuo, Meeting Abstracts of the Physical Society of Japan,   2016 09 23
    Summary:

    強相関ボース原子系の代表例としてボースハバードモデルやその拡張が知られている。3次元光格子上の冷却ボース原子系を使って最近接斥力を追加した拡張ボースハバードモデルが構成できるが,その相互作用パラメータを調節することで,この系はヒッグス場を含む3次元U(1)格子ゲージ理論と等価になる。すなわち冷却原子系が格子ゲージ理論の量子シミュレータとなる。本発表では実際の実験の手引きとなることをめざして,このモデルの相構造やGross-Pitaevskii方程式による時間発展を調べる。

  • Real time dynamics of a pair of half quantum vortices in two-component Bose-Einstein condensates, Kasamatsu Kenichi, Eto Minoru, Nitta Muneto, Meeting Abstracts of the Physical Society of Japan,   2016
    Summary:

    2成分BECにおける2つの半整数量子渦がどのような実時間発展を行うのかを2次元Gross-Pitaevskii方程式の数値解析により調べ、異成分間相互作用の性質および渦の循環の方向に依存して非自明な振る舞いをすることを明らかにした。得られた結果を渦点モデルの解析を用いて考察し,その結果の詳細を発表する。

  • 21aAG-14 Atomic simulation of U(1) lattice gauge-Higgs model : the dynamics of the electric flux in confinement phase and Higgs phase, Kuno Y, Kasamatsu K, Takahashi Y, Ichinose I, Matsui T, Meeting Abstracts of the Physical Society of Japan,   2015
  • 27aCF-8 Nambu-Goldstone Modes in Segregated Bose-Einstein Condensates, Takeuchi H, Kasamatsu K, Meeting Abstracts of the Physical Society of Japan,   2014
  • 9pBA-2 Dynamics of quantized vortices in BEG of cold atoms, Kasamatsu Kenichi, Meeting Abstracts of the Physical Society of Japan,   2014
  • 9pBA-2 Dynamics of quantized vortices in BEC of cold atoms, Kasamatsu Kenichi, Meeting Abstracts of the Physical Society of Japan,   2014
  • 9pBA-2 Dynamics of quantized vortices in BEC of cold atoms, Kasamatsu Kenichi, Meeting Abstracts of the Physical Society of Japan,   2014
  • Effect of 'Extra-Dimension' on Tachyon Condensation via Do- main Wall Annihilation in Segregated Bose-Einstein Condensates, Takeuchi H, Kasamatsu K, Tsubota M, Nitta M, Meeting Abstracts of the Physical Society of Japan,   2013
  • 29aEE-6 Local Gauge Symmetry and its Breaking as Higgs Couplings in Atomic Quantum Simulation of Dynamical Gauge Fields, Kasamatsu Kenichi, Ichinose Ikuo, Matsui Tetsuo, Meeting Abstracts of the Physical Society of Japan,   2013
  • 18aAL-6 Topological Aspects of Tachyon Condensation : Domain Wall Annihilation and Vorton Creation, Nitta Muneto, Kasamatsu Kenichi, Tsubota Makoto, Takeuchi Hiromitsu, Meeting Abstracts of the Physical Society of Japan,   2012
  • 18aAL-5 Tachyon condensation in Bose-Einstein condensates : Spontaneous symmetry breaking restricted in lower-dimensional subspace, Takeuchi H, Kasamatsu K, Tsubota M, Nitta M, Meeting Abstracts of the Physical Society of Japan,   2012
  • 18aAL-4 Structure of D-brane soliton in Bose-Einstein condensates, Kasamatsu K, Takeuchi H, Tsubota M, Nitta M, Meeting Abstracts of the Physical Society of Japan,   2012
  • 26pAG-14 Finite-temperature phase structure of hard core bosons in an optical lattice subject to an effective magnetic field, Kasamatsu K, Nakano Y, Matsui T, Meeting Abstracts of the Physical Society of Japan,   2012
  • 21aEE-3 Interaction of vortices in two-component Bose-Einstein condensates, Takeuchi H, Kasamatsu K, Nitta.M, Tsubota M, Meeting Abstracts of the Physical Society of Japan,   2011
  • 26aRA-4 Dynamics of hard-core boson systems in an optical lattice with effective magnetic fields, Nakano Yuki, Kato Akira, Kasamatsu Kenichi, Matsui Tetsuo, Meeting Abstracts of the Physical Society of Japan,   2011
  • 26aRA-3 Vortex lattice formation in a rotating two-dimensional lattice of Bose-Einstein Condensates, Kato A, Nakano Y, Kasamatsu K, Matsui T, Meeting Abstracts of the Physical Society of Japan,   2011
  • 25pRD-1 Crossover between Kelvin-Helmholtz and counter-superflow instabilities in two-component Bose-Einstein condensates, Suzuki Naoya, Takeuchi Hiromitsu, Kasamatsu Kenichi, Tsubota Makoto, Saito Hiroki, Meeting Abstracts of the Physical Society of Japan,   2011
  • Selective two-qubit gate operation in neutral atom quantum computer,   2010 09
  • Neutral Atom Quantum Computer with On-demand Interaction, 10'th Asian Conference on Quantum Information Science,   2010 08 , 10'th Asian Conference on Quantum Information Science
  • Trapping single atom with optical near-fields,   2010 03
  • 26aRD-7 Phase structure of hard-core boson systems in an optical lattice with effective magnetic fields, Nakano Yuki, Kasamatsu Kenichi, Matsui Tetsuo, Meeting Abstracts of the Physical Society of Japan,   2010
  • 25aRD-4 Nucleations of Quantized Vortices from Pair Annihilations of Domain Walls in Bose-Einstein Condensates : Nucleations of Strings from Pair Annihilations of D-brane and Anti-D-brane, Takeuchi H, Kasamatsu K, Nitta M, Tsubota M, Meeting Abstracts of the Physical Society of Japan,   2010
  • 25aRD-3 Mechanism of vortex formation in a Bose-Einstein condensate under oscillatory excitations, Kasamatsu K, Kobayashi M, Tsubota M, Meeting Abstracts of the Physical Society of Japan,   2010
  • 22pEH-6 Phase structure of hard core boson system in an optical lattice with magnetic field, Nakano Yuki, Kasamatsu Kenichi, Matsui Tetsuo, Meeting Abstracts of the Physical Society of Japan,   2010
  • 21pTB-6 Dependence of numerical accuracy and dissipation for vortex lattice formation in a rotating Bose-Einstein condensate, Kasamatsu K, Kobayashi M, Ueda M, Tsubota M, Meeting Abstracts of the Physical Society of Japan,   2010
  • 21aTD-3 Quantized vortices in atomic Bose-Einstein condensate, Kasamatsu Kenichi, Meeting Abstracts of the Physical Society of Japan,   2010
  • 20pTB-6 D-branes in Two-component Bose-Einstein Condensates, Kasamatsu K, Takeuchi H, Nitta M, Tsubota M, Meeting Abstracts of the Physical Society of Japan,   2010
  • 27pZK-7 Quantized vortices in atomic Bose-Einstein condensates, Kasamatsu Kenichi, Meeting Abstracts of the Physical Society of Japan,   2009
  • 27pZK-7 Quantized vortices in atomic Bose-Einstein condensates, Kasamatsu Kenichi, Meeting Abstracts of the Physical Society of Japan,   2009
  • 25pZE-1 Quantum Kelvin-Helmholtz Instability, Takeuchi H, Kasamatsu K, Tsubota M, Meeting Abstracts of the Physical Society of Japan,   2009
  • 28aSL-9 Vortex sheet structure in rotating two-component Bose-Einstein condensates, Kasamatsu K, Tsubota M, Meeting Abstracts of the Physical Society of Japan,   2009
  • 22aZD-3 Uniformly frustrated Josephson junction array in atomic Bose-Einstein condesates, Kasamatsu K, Meeting Abstracts of the Physical Society of Japan,   2008
  • 18aXJ-5 Dynamical vortex phases in a Bose condensate driven by a rotating optical lattice, Kasamatsu K, Tsubota M, Meeting Abstracts of the Physical Society of Japan,   2007
  • 27pTB-8 Properties of quantized vortices in a Bose condensate in a rotating optical lattice, Kasamatsu K, Tsubota M, Meeting Abstracts of the Physical Society of Japan,   2006
  • Turbulence and Vortex Lattice in a Rotating BEC, SASA Narimasa, MACHIDA Masahiko, KASAMATSU Kenichi, TSUBOTA Makoto, NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan,   2006
    Summary:Dynamics of ultra-cold dilute gaseous Bose-Einstein condensate is described by the time-dependent Gross-Pitaevskii equation.Recently, M.Lobo et.al. and Parker et.al. argue that vortices are nucleated and vortex lattice state finally appear by their numerical simulation of the Gross-Pitaevskii equation without dissipation.The vortex lattice state appear after turbulent state which is generated by the dynamic instability.We analyze the numerical simulation to find areason of the formation of the vortex latticeand point out a issue of their numerical simulation.
  • 19aWA-13 Energy Dissipation and Turbulence in a rotating BEC, Sasa N, Machida M, Kasamatsu K, Tsubota M, Meeting Abstracts of the Physical Society of Japan,   2005
  • 25aYE-2 3-D Vortex Simulation in a rotating Bose-Einstein Condensate, Sasa N, Machida M, Kasamatsu K, Tsubota M, Meeting Abstracts of the Physical Society of Japan,   2005
  • 25aYE-1 Structure of vortex lattices in rotating two component Bose-Einstein condensates in anharmonic trapping potential, Takeuchi H, Kasamatsu K, Tsubota M, Meeting Abstracts of the Physical Society of Japan,   2005
  • 27pXG-1 Dynamics of multiple domain formation in two-component Bose-Einstein condensates, Kasamatsu K, Tsubota M, Meeting Abstracts of the Physical Society of Japan,   2004
  • 12aTF-7 Vortex molecules in coherently coupled two-component Bose-Einstein condensates, Kasamatsu K, Tsubota M, Ueda M, Meeting Abstracts of the Physical Society of Japan,   2004
  • Interaction effect and mode coupling in the collective excitation of two-component Bose-Einstein condensates, Kasamatsu K, Tsubota M, Ueda M, Meeting Abstracts of the Physical Society of Japan,   2003
  • Vortex state in two-component Bose-Einstein condensates : the effect of the internal Josepbson coupling, Kasamatsu K, Tsubota M, Ueda M, Meeting Abstracts of the Physical Society of Japan,   2003
  • 27aWM-12 Vortex lattice formation in a fast rotating BEC trappea by combinedquadratic and quartic potentials., Kasamatsu K, Tsubota M, Ueda M, Meeting Abstracts of the Physical Society of Japan,   2002
  • Vortex lattice formation in a rotating two-component Bose condensate., Kasamatsu K, Tsubota M, Ueda M, Meeting Abstracts of the Physical Society of Japan,   2002
  • Formation and collapse of the array of quantized vortices in a rorating alkali atomic Bosc-Einstein condensate, Kasamatsu A, Tsubota M, Ueda M, Meeting Abstracts of the Physical Society of Japan,   2001
  • Vortex array dynamics in rotating BEC by the anallysis of the GP equation, Tsubota M, Kasamatsu K, Ueda M, Meeting Abstracts of the Physical Society of Japan,   2001
  • Vortex generation in cyclically coupled superfluids and the Kibble-Zurek mechanism, Kasamatsu K, Tsubota M, Meeting Abstracts of the Physical Society of Japan,   2001
  • Macroscopic quantum tunneling of metastable two-component Bose-Einstein condensates., Kasamatsu K, Yasui Y, Tsubota M, Meeting Abstracts of the Physical Society of Japan,   2001
  • Macroscopic quantum tunneling of two-component Bose-Einstein condensate, Kasamatsu K, Tsubota M, Yasui Y, Meeting Abstracts of the Physical Society of Japan,   2000
  • 26aYM-5 Josephson effect in three-component Bose-Einstein condensate, Kasamatsu K, Tsubota M, Meeting Abstracts of the Physical Society of Japan,   1999

Awards & Honors

  •   2013 01 , Americal Physical Society, Outstanding Referee

Research Grants & Projects

  • Ministry of Education, Culture, Sports, Science and Technology, Grants-in-Aid for Scientific Research(基盤研究(B)), Construction of Quantum Hydrodynamics
  • Ministry of Education, Culture, Sports, Science and Technology, Grants-in-Aid for Scientific Research(若手研究(B)), Solitons and topological defects in multicomponent Bose-Einstein condensates