Energy gaps and roton structure above the ν=1/2 Laughlin state of a rotating dilute Bose-Einstein condensate -: art. no. 140401

被引：22

作者：

Nakajima, T ^{[1
]}

Ueda, M

机构：

[1] Tohoku Univ, Grad Sch Sci, Dept Phys, Sendai, Miyagi 9808578, Japan

[2] Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1528551, Japan

[3] Japan Sci & Technol Corp, CREST, Saitama 3320012, Japan

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 14期

关键词：

D O I：

10.1103/PhysRevLett.91.140401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Exact diagonalization study of a rotating dilute Bose-Einstein condensate reveals that as the first vortex enters the system the degeneracy of the low-energy yrast spectrum is lifted and a large energy gap emerges. As more vortices enter with faster rotation, the energy gap decreases towards zero, but eventually the spectrum exhibits a rotonlike structure above the nu=1/2 Laughlin state without having a phonon branch despite the short-range nature of the interaction.

引用

页数：4

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