Supersolids versus phase separation in two-dimensional lattice bosons

被引：197

作者：

Sengupta, P ^{[1
]}

Pryadko, LP

Alet, F

Troyer, M

Schmid, G

机构：

[1] Univ Calif Riverside, Dept Phys, Riverside, CA 92521 USA

[2] ETH, CH-8093 Zurich, Switzerland

[3] CEA Saclay, CNRS, URA 2306, Serv Phys Theor, F-91191 Gif Sur Yvette, France

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.94.207202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the nature of the ground state of the two-dimensional extended boson Hubbard model on a square lattice by quantum Monte Carlo methods. We demonstrate that strong but finite on-site interaction U along with a comparable nearest-neighbor repulsion V result in a thermodynamically stable supersolid ground state for densities larger than 1/2, in contrast to fillings less than 1/2 or for very large U, where the checkerboard supersolid is unstable towards phase separation. We discuss the relevance of our results to realizations of supersolids using cold bosonic atoms in optical lattices.

引用

页数：4

共 34 条

[1]

Anderson P.W., 1984, Basic Notions of Condensed Matter Physics

[2]

ANDREEV AF, 1969, SOV PHYS JETP-USSR, V29, P1107

[3] SUPERSOLIDS IN THE BOSE-HUBHARD HAMILTONIAN [J].

BATROUNI, GG ;

SCALETTAR, RT ;

ZIMANYI, GT ;

KAMPF, AP .

PHYSICAL REVIEW LETTERS, 1995, 74 (13) :2527-2530

[4] Phase separation in supersolids [J].

Batrouni, GG ;

Scalettar, RT .

PHYSICAL REVIEW LETTERS, 2000, 84 (07) :1599-1602

[5] Supersolid versus phase separation in atomic Bose-Fermi mixtures -: art. no. 130404 [J].

Büchler, HP ;

Blatter, G .

PHYSICAL REVIEW LETTERS, 2003, 91 (13)

[6] SPECULATIONS ON BOSE-EINSTEIN CONDENSATION AND QUANTUM CRYSTALS [J].

CHESTER, GV .

PHYSICAL REVIEW A, 1970, 2 (01) :256-&

[7] Bose metal: Gauge-field fluctuations and scaling for field-tuned quantum phase transitions [J].

Das, D ;

Doniach, S .

PHYSICAL REVIEW B, 2001, 64 (13)

[8] Critical behavior of the supersolid transition in Bose-Hubbard models [J].

Frey, E ;

Balents, L .

PHYSICAL REVIEW B, 1997, 55 (02) :1050-1067

[9] Quantum phases of dipolar bosons in optical lattices -: art. no. 170406 [J].

Góral, K ;

Santos, L ;

Lewenstein, M .

PHYSICAL REVIEW LETTERS, 2002, 88 (17) :4

[10] Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms [J].

Greiner, M ;

Mandel, O ;

Esslinger, T ;

Hänsch, TW ;

Bloch, I .

NATURE, 2002, 415 (6867) :39-44

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