Mean-field and stability analyses of two-dimensional flowing soft-core bosons modeling a supersolid

被引：56

作者：

Kunimi, Masaya ^{[1
]}

Kato, Yusuke ^{[1
]}

机构：

[1] Univ Tokyo, Dept Basic Sci, Tokyo 1538902, Japan

来源：

PHYSICAL REVIEW B | 2012年 / 86卷 / 06期

关键词：

HELIUM-II; SUPERFLUIDITY; SUPERFLOW; CRYSTALS;

D O I：

10.1103/PhysRevB.86.060510

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The soft-core boson system is one of the simplest models of supersolids, which have both off-diagonal long-range order (Bose-Einstein condensation) and diagonal long-range order (crystalline order). Although this model has been studied from various points of view, studies of the stability of current-flowing states are lacking. Solving the Gross-Pitaevskii and Bogoliubov equations, we obtain excitation spectra in superfluid, supersolid, and stripe phases. On the basis of the results of the excitation spectra, we present a stability phase diagram that shows the region of the metastable superflow states for each phase.

引用

页数：4

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