Discerning Incompressible and Compressible Phases of Cold Atoms in Optical Lattices

被引：53
作者：
Scarola, V. W. [1 ,2 ,4 ]
Pollet, L. [2 ]
Oitmaa, J. [3 ]
Troyer, M. [2 ]
机构：
[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA
[2] Swiss Fed Inst Technol, CH-8093 Zurich, Switzerland
[3] Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia
[4] Univ Calif Berkeley, Pitzer Ctr Theoret Chem, Berkeley, CA 94720 USA
来源：
PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 13期
基金：
瑞士国家科学基金会;
关键词：
MOTT INSULATOR; HUBBARD-MODEL; BOSONIC ATOMS; GAS;
D O I：
10.1103/PhysRevLett.102.135302
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Experiments with cold atoms trapped in optical lattices offer the potential to realize a variety of novel phases but suffer from severe spatial inhomogeneity that can obscure signatures of new phases of matter and phase boundaries. We use a high temperature series expansion to show that compressibility in the core of a trapped Fermi-Hubbard system is related to measurements of changes in double occupancy. This core compressibility filters out edge effects, offering a direct probe of compressibility independent of inhomogeneity. A comparison with experiments is made.
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页数：4
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