Sub-Poissonian fluctuations in a 1D Bose gas: From the quantum quasicondensate to the strongly interacting regime

Jacqmin, Thibaut, Armijo, Julien, Berrada, Tarik, Kheruntsyan, Karen V. and Bouchoule, Isabelle (2011) Sub-Poissonian fluctuations in a 1D Bose gas: From the quantum quasicondensate to the strongly interacting regime. Physical Review Letters, 106 23: 230405-1-230405-4. doi:10.1103/PhysRevLett.106.230405

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Author Jacqmin, Thibaut
Armijo, Julien
Berrada, Tarik
Kheruntsyan, Karen V.
Bouchoule, Isabelle
Title Sub-Poissonian fluctuations in a 1D Bose gas: From the quantum quasicondensate to the strongly interacting regime
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 0031-9007
1079-7114
1092-0145
Publication date 2011-06-10
Year available 2011
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.106.230405
Open Access Status File (Publisher version)
Volume 106
Issue 23
Start page 230405-1
End page 230405-4
Total pages 4
Place of publication Melville, NY, United States
Publisher American Physical Society
Language eng
Subject 3100 Physics and Astronomy
Abstract We report on local, in situ measurements of atom number fluctuations in slices of a one-dimensional Bose gas on an atom chip setup. By using current modulation techniques to prevent cloud fragmentation, we are able to probe the crossover from weak to strong interactions. For weak interactions, fluctuations go continuously from super- to sub-Poissonian as the density is increased, which is a signature of the transition between the subregimes where the two-body correlation function is dominated, respectively, by thermal and quantum contributions. At stronger interactions, the super-Poissonian region disappears, and the fluctuations go directly from Poissonian to sub-Poissonian, as expected for a "fermionized'' gas.
Formatted abstract
We report on local, in situ measurements of atom number fluctuations in slices of a one-dimensional
Bose gas on an atom chip setup. By using current modulation techniques to prevent cloud fragmentation,
we are able to probe the crossover from weak to strong interactions. For weak interactions, fluctuations go
continuously from super- to sub-Poissonian as the density is increased, which is a signature of the
transition between the subregimes where the two-body correlation function is dominated, respectively, by
thermal and quantum contributions. At stronger interactions, the super-Poissonian region disappears, and
the fluctuations go directly from Poissonian to sub-Poissonian, as expected for a ‘‘fermionized’’ gas.
Keyword Physics, Multidisciplinary
Physics
PHYSICS, MULTIDISCIPLINARY
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID ANR-08-BLAN-0165-03
DP110101047
I607
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2012 Collection
 
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Created: Fri, 05 Aug 2011, 23:16:21 EST by Dr Karen Kheruntsyan on behalf of School of Mathematics & Physics