Vortex Tiling in a Spin-2 Spinor Bose-Einstein Condensate (2009)
Kobayashi, Michikazu, Kawaguchi, Yuki, Ueda, Masahito
We investigate core structures of fractional vortices in a spin-2 spinor Bose-Einstein condensate and find that commensurability between discrete symmetries of the order parameters inside and outside...
Collision Dynamics and Gluon Rung of Non-Abelian Vortices (2008)
Kobayashi, Michikazu, Kawaguchi, Yuki, Nitta, Muneto, Ueda, Masahito
We investigate collision dynamics of two non-Abelian vortices and find that unlike Abelian vortices, they do not reconnect themselves but create a gluon rung between them. This affords direct...
Spacetime analogue of Bose-Einstein condensates: Bogoliubov-de Gennes formulation (2008)
Kurita, Yasunari, Kobayashi, Michikazu, Morinari, Takao, Tsubota, Makoto, Ishihara, Hideki
We construct quantum field theory in an analogue curved spacetime in Bose-Einstein condensates based on the Bogoliubov-de Gennes equations, by exactly relating quantum particles in curved spacetime...
Quantum Turbulence in a Trapped Bose-Einstein Condensate (2007)
Kobayashi, Michikazu, Tsubota, Makoto
We study quantum turbulence in trapped Bose-Einstein condensates by numerically solving the Gross-Pitaevskii equation. Combining rotations around two axes, we successfully induce quantum turbulent...
Thermal dissipation in quantum turbulence (2006)
Kobayashi, Michikazu, Tsubota, Makoto
The microscopic mechanism of thermal dissipation in quantum turbulence has been numerically studied by solving the coupled system involving the Gross-Pitaevskii equation and the Bogoliubov-de Gennes...
Kobayashi, Michikazu, Tsubota, Makoto
We develop a model of a strongly correlated Bose fluid model in a confined potential for the purpose of analyzing the localization of Bose-Einstein condensation and the disappearance of...
Kolmogorov Spectrum of Quantum Turbulence (2005)
Kobayashi, Michikazu, Tsubota, Makoto
There is a growing interest in the relation between classical turbulence and quantum turbulence. Classical turbulence arises from complicated dynamics of eddies in a classical fluid. In contrast,...
Inertial Range and the Kolmogorov Spectrum of Quantum Turbulenc (2005)
Tsubota, Makoto, Kobayashi, Michikazu
Quantum turbulence is numerically studied by solving the Gross-Pitaevskii equation. Introducing both the energy dissipation at small scales and the energy injection at large scales, we succeed in...
Kobayashi, Michikazu, Tsubota, Makoto
We develop a Bose fluid model in a confined potential to consider the new quantum phase due to the localization of Bose-Einstein condensation and disappearance of superfluidity which is recently...
Bose-Einstein condensation and superfluidity of dilute Bose gas in a random potential (2002)
Kobayashi, Michikazu, Tsubota, Makoto
We develop the dilute Bose gas model with random potential in order to understand the Bose system in random media such as 4He in porous glass. Using the random potential taking account of the pore...