Zobrazeno 1 - 10
of 205
pro vyhledávání: '"Nikuni, T."'
Publikováno v:
J. Low Temp. Phys. (2018)
We investigate collective excitations of density fluctuations and a dynamic density structure factor in a mixture of Bose and Fermi gases in a normal phase. With decreasing temperature, we find that the frequency of the collective excitation deviates
Externí odkaz:
http://arxiv.org/abs/1807.06747
Autor:
Motohashi, A., Nikuni, T.
We investigate the dynamics of two-component Bose-Josephson junction composed of atom-molecule BECs. Within the semiclassical approximation, the multi-degree of freedom of this system permits chaotic dynamics, which does not occur in single-component
Externí odkaz:
http://arxiv.org/abs/0911.1854
Publikováno v:
Phys. Rev. A 78, 015602 (2008)
We investigate the effects of the adiabatic loading of optical lattices to the temperature by applying the mean-field approximation to the three-dimensional Bose-Hubbard model at finite temperatures. We compute the lattice-height dependence of the is
Externí odkaz:
http://arxiv.org/abs/0803.1548
We study the vortex pinning effect in a Bose-Einstein Condensate in the presence of a rotating lattice potential by numerically solving the time-dependent Gross-Pitaevskii equation. We consider a triangular lattice potential created by blue-detuned l
Externí odkaz:
http://arxiv.org/abs/0706.0759
We determine the adiabatic phase diagram of a resonantly-coupled system of Fermi atoms and Bose molecules confined in the harmonic trap by using the local density approximation. The adiabatic phase diagram shows the fermionic condensate fraction comp
Externí odkaz:
http://arxiv.org/abs/cond-mat/0610079
We study vortex lattice structures of a trapped Bose-Einstein condensate in a rotating lattice potential by numerically solving the time-dependent Gross-Pitaevskii equation. By rotating the lattice potential, we observe the transition from the Abriko
Externí odkaz:
http://arxiv.org/abs/cond-mat/0607166
Autor:
Arahata, E., Nikuni, T.
We study equilibrium properties of Bose-Condensed gases in a one-dimensional (1D) optical lattice at finite temperatures. We assume that an additional harmonic confinement is highly anisotropic, in which the confinement in the radial directions is mu
Externí odkaz:
http://arxiv.org/abs/cond-mat/0607103
Publikováno v:
J. Low Temp. Phys. 148, 345 (2007).
We determine the adiabatic phase diagrams for a resonantly-coupled system of Fermi atoms and Bose molecules confined in a harmonic trap by using the local density approximation. The key idea of our work is conservation of entropy through the adiabati
Externí odkaz:
http://arxiv.org/abs/cond-mat/0607123
Publikováno v:
Phys. Rev. A 73, 033621 (2006)
We study single-particle excitations in the Mott insulator phase of a Bose gas in an optical lattice. The characteristic feature of the single-particle spectrum in the Mott insulator phase is the existence of an energy gap between the particle and ho
Externí odkaz:
http://arxiv.org/abs/cond-mat/0407229
We present a nonequilibrium kinetic theory describing atom-molecule population dynamics in a two-component Fermi gas with a Feshbach resonance. Key collision integrals emerge that govern the relaxation of the atom-molecule mixture to chemical and the
Externí odkaz:
http://arxiv.org/abs/cond-mat/0403503