Observation of Thermally Activated Vortex Pairs in a Quasi-2D Bose Gas

被引：42

作者：

Choi, Jae-yoon ^{[1
]}

Seo, Sang Won

Shin, Yong-il

机构：

[1] Seoul Natl Univ, Ctr Subwavelength Opt, Seoul 151747, South Korea

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 17期

关键词：

LONG-RANGE ORDER; TRANSITION;

D O I：

10.1103/PhysRevLett.110.175302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We measure the in-plane distribution of thermally activated vortices in a trapped quasi-2D Bose gas, where we enhance the visibility of density-depleted vortex cores by radially compressing the sample before releasing the trap. The pairing of vortices is revealed by the two-vortex spatial correlation function obtained from the vortex distribution. The vortex density decreases gradually as temperature is lowered, and below a certain temperature, a vortex-free region emerges in the center of the sample. This shows the crossover from a Berezinskii-Kosterlitz-Thouless phase containing vortex-pair excitations to a vortex-free Bose-Einstein condensate in a finite-size 2D system. DOI: 10.1103/PhysRevLett.110.175302

引用

页数：5

共 31 条

[21] KOSTERLITZ-THOULESS TRANSITION IN PROXIMITY-COUPLED SUPERCONDUCTING ARRAYS [J].

RESNICK, DJ ;

GARLAND, JC ;

BOYD, JT ;

SHOEMAKER, S ;

NEWROCK, RS .

PHYSICAL REVIEW LETTERS, 1981, 47 (21) :1542-1545

[22] Single vortex-antivortex pair in an exciton-polariton condensate [J].

Roumpos, Georgios ;

Fraser, Michael D. ;

Loeffler, Andreas ;

Hoefling, Sven ;

Forchel, Alfred ;

Yamamoto, Yoshihisa .

NATURE PHYSICS, 2011, 7 (02) :129-133

[23] Observation of quasicondensate in two-dimensional atomic hydrogen [J].

Safonov, AI ;

Vasilyev, SA ;

Yasnikov, IS ;

Lukashevich, II ;

Jaakkola, S .

PHYSICAL REVIEW LETTERS, 1998, 81 (21) :4545-4548

[24] Thermodynamically activated vortex-dipole formation in a two-dimensional Bose-Einstein condensate [J].

Schumayer, Daniel ;

Hutchinson, David A. W. .

PHYSICAL REVIEW A, 2007, 75 (01)

[25] Vortex proliferation in the Berezinskii-Kosterlitz-Thouless regime on a two-dimensional lattice of bose-einstein condensates [J].

Schweikhard, V. ;

Tung, S. ;

Cornell, E. A. .

PHYSICAL REVIEW LETTERS, 2007, 99 (03)

[26] Thermal activation of vortex-antivortex pairs in quasi-two-dimensional Bose-Einstein condensates [J].

Simula, TP ;

Blakie, PB .

PHYSICAL REVIEW LETTERS, 2006, 96 (02)

[27] Transition from the Bose-Einstein condensate to the Berezinskii-Kosterlitz-Thouless phase [J].

Simula, TP ;

Lee, MD ;

Hutchinson, DAW .

PHILOSOPHICAL MAGAZINE LETTERS, 2005, 85 (08) :395-403

[28] Evolution of Fermion Pairing from Three to Two Dimensions [J].

Sommer, Ariel T. ;

Cheuk, Lawrence W. ;

Ku, Mark J. H. ;

Bakr, Waseem S. ;

Zwierlein, Martin W. .

PHYSICAL REVIEW LETTERS, 2012, 108 (04)

[29] Measurement of the vortex pair interaction potential in a type-II superconductor [J].

Sow, CH ;

Harada, K ;

Tonomura, A ;

Crabtree, G ;

Grier, DG .

PHYSICAL REVIEW LETTERS, 1998, 80 (12) :2693-2696

[30] Observation of the Presuperfluid Regime in a Two-Dimensional Bose Gas [J].

Tung, S. ;

Lamporesi, G. ;

Lobser, D. ;

Xia, L. ;

Cornell, E. A. .

PHYSICAL REVIEW LETTERS, 2010, 105 (23)

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