Quantum critical region of ultracold Bose gases exhibiting universal density-probability distribution after free expansion

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	Quantum critical region of ultracold Bose gases exhibiting universal density-probability distribution after free expansion
	Zhu, Qiang 1,2; Wang, Bing 1,2; Sun, Chao 1,2; Xiong, Dezhi 1; Xiong, Hongwei 3; Lu, Baolong 1
刊名	NEW JOURNAL OF PHYSICS
	2015-06-15
卷号	17
关键词	quantum critical gas density probability phase fluctuation universal behavior
英文摘要	We report the observation of a universal behavior of ultracold quantum critical (QC) Bose gases trapped in a one-dimensional optical lattice. We extract the density probability distributions from the measured atomic density of the rubidium Bose gases after a free expansion time. The density probability is found to follow a simple exponential law once the lattice system has entered the QC region above the Berezinskii-Kosterlitz-Thouless transition. We show that, in addition to relative phase fluctuations between the subcondensates in different lattice wells, there also exist spatial phase fluctuations within single lattice wells in this QC region. The universal density-probability distribution can thus be well understood by a simple theoretical model taking into account these two kinds of phase fluctuations.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Physics, Multidisciplinary
研究领域[WOS]	Physics
关键词[WOS]	OPTICAL LATTICES ; 2-DIMENSIONAL SYSTEMS ; PHASE-TRANSITIONS ; ATOMS ; INSULATOR ; SUPERFLUID ; ORDER
收录类别	SCI
语种	英语
WOS记录号	WOS:000358927600001
公开日期	2016-05-09
内容类型	期刊论文
源URL	[http://ir.wipm.ac.cn/handle/112942/7834]
专题	武汉物理与数学研究所_原子频标研究部
作者单位	1.Chinese Acad Sci, Wuhan Inst Phys & Math, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Zhejiang Univ Technol, Dept Appl Phys, Wilczek Quantum Ctr, Hangzhou 310023, Zhejiang, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Qiang,Wang, Bing,Sun, Chao,et al. Quantum critical region of ultracold Bose gases exhibiting universal density-probability distribution after free expansion[J]. NEW JOURNAL OF PHYSICS,2015,17.
APA	Zhu, Qiang,Wang, Bing,Sun, Chao,Xiong, Dezhi,Xiong, Hongwei,&Lu, Baolong.(2015).Quantum critical region of ultracold Bose gases exhibiting universal density-probability distribution after free expansion.NEW JOURNAL OF PHYSICS,17.
MLA	Zhu, Qiang,et al."Quantum critical region of ultracold Bose gases exhibiting universal density-probability distribution after free expansion".NEW JOURNAL OF PHYSICS 17(2015).