Disordered Bosons: Condensate and Excitations

Дата и время публикации : 1993-07-19T16:26:55Z

Авторы публикации и институты :
K. G. Singh
D. S. Rokhsar

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: RevTeX, 26 pages and 10 postscript figures appended (Figure 9 has three separate plots, so 12 postcript files altogether)
Первичная категория: cond-mat

Все категории : cond-mat

Краткий обзор статьи: The disordered Bose Hubbard model is studied numerically within the Bogoliubov approximation. First, the spatially varying condensate wavefunction in the presence of disorder is found by solving a nonlinear Schrodinger equation. Using the Bogoliubov approximation to find the excitations above this condensate, we calculate the condensate fraction, superfluid density, and density of states for a two-dimensional disordered system. These results are compared with experiments done with ${}^4{rm He}$ adsorbed in porous media.

Category: Physics