Phase coherence of an atomic Mott insulator -: art. no. 050404

被引：144

作者：

Gerbier, F ^{[1
]}

Widera, A ^{[1
]}

Fölling, S ^{[1
]}

Mandel, O ^{[1
]}

Gericke, T ^{[1
]}

Bloch, I ^{[1
]}

机构：

[1] Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 05期

关键词：

D O I：

10.1103/PhysRevLett.95.050404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the phase coherence properties of ultracold Bose gases in optical lattices, with special emphasis on the Mott insulating phase. We show that phase coherence on short length scales persists even deep in the insulating phase, preserving a finite visibility of the interference pattern observed after free expansion. This behavior can be attributed to a coherent admixture of particle-hole pairs to the perfect Mott state for small but finite tunneling. In addition, small but reproducible kinks are seen in the visibility, in a broad range of atom numbers. We interpret them as signatures for density redistribution in the shell structure of the trapped Mott insulator.

引用

页数：4

共 27 条

[1] Observation of interference between two Bose condensates [J].

Andrews, MR ;

Townsend, CG ;

Miesner, HJ ;

Durfee, DS ;

Kurn, DM ;

Ketterle, W .

SCIENCE, 1997, 275 (5300) :637-641

[2] Mott domains of bosons confined on optical lattices [J].

Batrouni, GG ;

Rousseau, V ;

Scalettar, RT ;

Rigol, M ;

Muramatsu, A ;

Denteneer, PJH ;

Troyer, M .

PHYSICAL REVIEW LETTERS, 2002, 89 (11)

[3] Measurement of the spatial coherence of a trapped Bose gas at the phase transition [J].

Bloch, I ;

Hänsch, TW ;

Esslinger, T .

NATURE, 2000, 403 (6766) :166-170

[4] 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)

[5] Observation of phase fluctuations in elongated Bose-Einstein condensates [J].

Dettmer, S ;

Hellweg, D ;

Ryytty, P ;

Arlt, JJ ;

Ertmer, W ;

Sengstock, K ;

Petrov, DS ;

Shlyapnikov, GV ;

Kreutzmann, H ;

Santos, L ;

Lewenstein, M .

PHYSICAL REVIEW LETTERS, 2001, 87 (16) :art. no.-160406

[6]

GANGADT DM, CONDMAT0405437

[7] 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

[8]

HABZIBABIC Z, 2004, PHYS REV LETT, V93

[9] Measurement of the coherence of a Bose-Einstein condensate [J].

Hagley, EW ;

Deng, L ;

Kozuma, M ;

Trippenbach, M ;

Band, YB ;

Edwards, M ;

Doery, M ;

Julienne, PS ;

Helmerson, K ;

Rolston, SL ;

Phillips, WD .

PHYSICAL REVIEW LETTERS, 1999, 83 (16) :3112-3115

[10] Measurement of the spatial correlation function of phase fluctuating Bose-Einstein condensates [J].

Hellweg, D ;

Cacciapuoti, L ;

Kottke, M ;

Schulte, T ;

Sengstock, K ;

Ertmer, W ;

Arlt, JJ .

PHYSICAL REVIEW LETTERS, 2003, 91 (01)

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