Рубрики:
SUPERFLUIDITY
Кл.слова (ненормированные):
Fluid dynamics -- Random processes -- Spectrum analysis -- High energy spectra -- Quasimomentum -- Random matrix theory -- High energy physics
SUPERFLUIDITY
Кл.слова (ненормированные):
Fluid dynamics -- Random processes -- Spectrum analysis -- High energy spectra -- Quasimomentum -- Random matrix theory -- High energy physics
Аннотация: We consider a small ensemble of Bose atoms in a ring optical lattice with weak disorder. The atoms are assumed to be initially prepared in a superfluid state with nonzero quasimomentum and, hence, may carry matter current. It is found that the atomic current persists in time for a low value of the quasimomentum but decays exponentially for a high (around one quarter of the Brillouin zone) quasimomentum. The explanation is given in terms of low- and high-energy spectra of the Bose-Hubbard model, which we describe using the Bogoliubov and random matrix theories, respectively.
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Держатели документа:
Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Max-Planck-Institut fur Physik Komplexer Systeme, 01187 Dresden, Germany
Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
Доп.точки доступа:
Коловский, Андрей Радиевич