Zobrazeno 1 - 10
of 27
pro vyhledávání: '"Isoshima, Tomoya"'
Autor:
Isoshima, Tomoya, Yip, Sungkit
Publikováno v:
J. Phys. Soc. Jpn. 75, 074605 (2006)
The spinor Bose-Einstein condensate of atomic gases has been experimentally realized by a number of groups. Further, theoretical proposals of the possible vortex states have been sugessted. This paper studies the effects of the quadratic Zeeman energ
Externí odkaz:
http://arxiv.org/abs/cond-mat/0607630
Autor:
Isoshima, Tomoya
We study Bose-Einstein condensate of atomic Boson gases trapped in a composite potential of a harmonic potential and an optical lattice potential. We found a series of collective excitations that induces localized vortex oscillations with a character
Externí odkaz:
http://arxiv.org/abs/cond-mat/0503509
Autor:
Isoshima, Tomoya, Salomaa, Martti M.
The excitation spectrum and the band structure of a Bose-Einstein condensate in a periodic potential are investigated. Analyses within full 3D systems, finite 1D systems, and ideal periodic 1D systems are compared. We find two branches of excitations
Externí odkaz:
http://arxiv.org/abs/cond-mat/0407225
We study the precessing motion of a vortex in a Bose-Einstein condensate of atomic gases. In addition to the former zero-temperature studies, finite temperature systems are treated within the Popov and semiclassical approximations. Precessing vortice
Externí odkaz:
http://arxiv.org/abs/cond-mat/0310651
We study numerically the excitations of off-centered vortices in a Bose-Einstein condensate. The displacement of a single vortex and the separation of a doubly quantized vortex are considered. We find that the core-localized excitations of the preces
Externí odkaz:
http://arxiv.org/abs/cond-mat/0212528
Autor:
Isoshima, Tomoya, Machida, Kazushige
The relative stability of various axisymmetric vortices in a spinor Bose-Einstein condensate with F=1 is examined within extended Bogoliubov theory. This yields the phase diagram in the plane of external rotation frequency vs magnetization. We compar
Externí odkaz:
http://arxiv.org/abs/cond-mat/0201507
Autor:
Isoshima, Tomoya
We propose a method to create a vortex in BEC utilizing the spin degree of freedom. We consider the optical plug at the center of the vortex, which makes the vortex-creation process stable. We also investigate the instability of the halfway state to
Externí odkaz:
http://arxiv.org/abs/cond-mat/0109514
The vortex phase diagram in the external rotation frequency versus temperature is calculated for dilute Bose-Einstein condensed gases. It is determined within the Bogoliubov-Popov theory for a finite temperature where the condensate and non-condensat
Externí odkaz:
http://arxiv.org/abs/cond-mat/0104358
Quantum vortices in the multi-component Bose-Einstein condensation (BEC) are investigated theoretically. It is found that three kinds of the vortex configurations are possible and their physical properties are discussed in details, including the dens
Externí odkaz:
http://arxiv.org/abs/cond-mat/0011421
It is investigated theoretically that magnetized Bose-Einstein condensation (BEC) with the internal (spin) degrees of freedom exhibits a rich variety of phase transitions, depending on the sign of the interaction in the spin channel. In the antiferro
Externí odkaz:
http://arxiv.org/abs/cond-mat/0005289