Off-diagonal long-range order in solid 4He

被引：106
|
作者：
Clark, BK [1 ]
Ceperley, DM
机构：
[1] Univ Illinois, Dept Phys, Urbana, IL 61801 USA
[2] Univ Illinois, NCSA, Urbana, IL 61801 USA
来源：
PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 10期
关键词：
D O I：
10.1103/PhysRevLett.96.105302
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Measurements of the moment of inertia by Kim and Chan have found that solid He-4 acts like a supersolid at low temperatures. To understand the order in solid He-4, we have used path integral Monte Carlo simulations to calculate the off-diagonal long-range order (ODLRO) [equivalent to Bose-Einstein condensation (BEC)]. We do not find ODLRO in a defect-free hcp crystal of He-4 at the melting density. We discuss these results in relation to proposed quantum solid trial functions. We conclude that the solid He-4 wave function has correlations which suppress both vacancies and BEC.
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页数：4
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