Bose-Hubbard model in the presence of Ohmic dissipation

被引：19

作者：

Dalidovich, Denis ^{[1
]}

Kennett, Malcolm P. ^{[1
]}

机构：

[1] Simon Fraser Univ, Dept Phys, Burnaby, BC V5A 1S6, Canada

来源：

PHYSICAL REVIEW A | 2009年 / 79卷 / 05期

基金：

加拿大自然科学与工程研究理事会;

关键词：

boson systems; chemical potential; Hubbard model; metal-insulator transition; superfluidity; JOSEPHSON-JUNCTION ARRAYS; QUANTUM; SUPERFLUID; INSULATOR; ATOMS;

D O I：

10.1103/PhysRevA.79.053611

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We study the zero temperature mean-field phase diagram of the Bose-Hubbard model in the presence of local coupling between the bosons and an external bath. We consider a coupling that conserves the on-site occupation number, preserving the robustness of the Mott-insulator and superfluid phases. We show that the coupling to the bath renormalizes the chemical potential and the interaction between the bosons and reduces the size of the superfluid regions between the insulating lobes. For strong enough coupling, a finite value of hopping is required to obtain superfluidity around the degeneracy points where Mott-insulator phases with different occupation numbers coexist.

引用

页数：4

共 32 条

[1]

[Anonymous], 2000, QUANTUM PHASE TRANSI

[2] Ultracold quantum gases in optical lattices [J].

Bloch, I .

NATURE PHYSICS, 2005, 1 (01) :23-30

[3] Many-body physics with ultracold gases [J].

Bloch, Immanuel ;

Dalibard, Jean ;

Zwerger, Wilhelm .

REVIEWS OF MODERN PHYSICS, 2008, 80 (03) :885-964

[4] The Bose-Hubbard model:: from Josephson junction arrays to optical lattices [J].

Bruder, C ;

Fazio, R ;

Schön, G .

ANNALEN DER PHYSIK, 2005, 14 (9-10) :566-577

[5] Polaron physics in optical lattices [J].

Bruderer, Martin ;

Klein, Alexander ;

Clark, Stephen R. ;

Jaksch, Dieter .

PHYSICAL REVIEW A, 2007, 76 (01)

[6] Structure and stability of Mott-insulator shells of bosons trapped in an optical lattice [J].

DeMarco, B ;

Lannert, C ;

Vishveshwara, S ;

Wei, TC .

PHYSICAL REVIEW A, 2005, 71 (06)

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

Dickerscheid, DBM ;

van Oosten, D ;

Denteneer, PJH ;

Stoof, HTC .

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

[8]

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

[9] Formation of spatial shell structure in the superfluid to Mott insulator transition [J].

Foelling, Simon ;

Widera, Artur ;

Mueller, Torben ;

Gerbier, Fabrice ;

Bloch, Immanuel .

PHYSICAL REVIEW LETTERS, 2006, 97 (06)

[10] Phase coherence of an atomic Mott insulator -: art. no. 050404 [J].

Gerbier, F ;

Widera, A ;

Fölling, S ;

Mandel, O ;

Gericke, T ;

Bloch, I .

PHYSICAL REVIEW LETTERS, 2005, 95 (05)

← 1 2 3 4 →