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题名: Two-dimensional Bose-Einstein condensate under pressure
作者: Cho, W;  Kim, SW;  Park, JH
刊名: NEW JOURNAL OF PHYSICS
出版日期: 2015
卷号: 17, 期号:0, 页码:13038
关键词: ideal Bose gas ;  emergence ;  first-order phase transition ;  two dimensions
学科分类: Physics
DOI: http://dx.doi.org/10.1088/1367-2630/17/1/013038
通讯作者: Cho, W (reprint author), Sogang Univ, Dept Phys, Seoul 121742, South Korea.
文章类型: Article
英文摘要: Evading the Mermin-Wagner-Hohenberg no-go theorem and revisiting with rigor the ideal Bose gas confined in a square box, we explore a discrete phase transition in two spatial dimensions. Through both analytic and numerical methods, we verify that thermodynamic instability emerges if the number of particles is sufficiently yet finitely large: specifically, N >= 35131. The instability implies that the isobar of the gas zigzags on the temperature-volume plane, featuring supercooling and superheating phenomena. The Bose-Einstein condensation can then persist from absolute zero to the superheating temperature. Without necessarily taking the large N limit, under a constant pressure condition, the condensation takes place discretely both in the momentum and in the position spaces. Our result is applicable to a harmonic trap. We assert that experimentally observed Bose-Einstein condensations of harmonically trapped atomic gases are a first-order phase transition that involves a discrete change of the density at the center of the trap.
类目[WOS]: Physics, Multidisciplinary
关键词[WOS]: LONG-RANGE ORDER ;  SYMMETRY ;  SYSTEMS ;  TRAPS
收录类别: SCI
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/21112
Appears in Collections:理论物理所2015年知识产出_期刊论文

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Recommended Citation:
Cho, W,Kim, SW,Park, JH. Two-dimensional Bose-Einstein condensate under pressure[J]. NEW JOURNAL OF PHYSICS,2015,17(0):13038.
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