Phase diagram for ultracold bosons in optical lattices and superlattices

被引：79

作者：

Buonsante, P

Vezzani, A

机构：

[1] Politecn Torino, Dipartimento Fis, I-10129 Turin, Italy

[2] INFM, I-10129 Turin, Italy

[3] Univ Parma, Dipartimento Fis, I-43100 Parma, Italy

[4] INFM, I-43100 Parma, Italy

来源：

PHYSICAL REVIEW A | 2004年 / 70卷 / 03期

关键词：

D O I：

10.1103/PhysRevA.70.033608

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We present an analytic description of the finite-temperature phase diagram of the Bose-Hubbard model, successfully describing the physics of cold bosonic atoms trapped in optical lattices and superlattices. Based on a standard statistical mechanics approach, we provide the exact expression for the boundary between the superfluid and the normal fluid by solving the self-consistency equations involved in the mean-field approximation to the Bose-Hubbard model. The zero-temperature limit of such a result supplies an analytic expression for the Mott lobes of superlattices, characterized by a critical fractional filling.

引用

页码：033608 / 1

页数：8

共 33 条

[11] Ultracold atoms in optical lattices [J].

Dickerscheid, DBM ;

van Oosten, D ;

Denteneer, PJH ;

Stoof, HTC .

PHYSICAL REVIEW A, 2003, 68 (04) :13

[12] Dynamics and thermodynamics of the Bose-Hubbard model [J].

Elstner, N ;

Monien, H .

PHYSICAL REVIEW B, 1999, 59 (19) :12184-12187

[13] Quantum phase transitions and vortex dynamics in superconducting networks [J].

Fazio, R ;

van der Zant, H .

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2001, 355 (04) :235-334

[14]

FISHER MPA, 1989, PHYS REV B, V40, P546, DOI [10.1103/PhysRevB.40.546, 10.1063/1.38820]

[15] PHASE-DIAGRAM OF THE BOSE-HUBBARD MODEL [J].

FREERICKS, JK ;

MONIEN, H .

EUROPHYSICS LETTERS, 1994, 26 (07) :545-550

[16]

GARCIARIPOLL JJ, CONDMAT0404566

[17]

GIAMPAOLO S, CONDMAT0403145

[18] Exploring phase coherence in a 2D lattice of Bose-Einstein condensates -: art. no. 160405 [J].

Greiner, M ;

Bloch, I ;

Mandel, O ;

Hänsch, TW ;

Esslinger, T .

PHYSICAL REVIEW LETTERS, 2001, 87 (16)

[19] Quasiperiodic optical lattices [J].

Guidoni, L ;

Triche, C ;

Verkerk, P ;

Grynberg, G .

PHYSICAL REVIEW LETTERS, 1997, 79 (18) :3363-3366

[20] Cold bosonic atoms in optical lattices [J].

Jaksch, D ;

Bruder, C ;

Cirac, JI ;

Gardiner, CW ;

Zoller, P .

PHYSICAL REVIEW LETTERS, 1998, 81 (15) :3108-3111

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