Sub-Poissonian Fluctuations in a 1D Bose Gas: From the Quantum Quasicondensate to the Strongly Interacting Regime

Journal Article · Fri Jun 10 04:00:00 EDT 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.106.230405· OSTI ID:21567441

Jacqmin, Thibaut; Armijo, Julien; Bouchoule, Isabelle ^[1]; Berrada, Tarik ^[1]; Kheruntsyan, Karen V ^[2]

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1. Laboratoire Charles Fabry, Institut d'Optique, UMR8501 du CNRS, 91127 Palaiseau Cedex (France)
2. School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland 4072 (Australia)

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.

• OSTI ID: 21567441
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 23 Vol. 106; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATOMS
BASIC INTERACTIONS
BOSE-EINSTEIN GAS
CORRELATION FUNCTIONS
DENSITY
FLUCTUATIONS
FRAGMENTATION
FUNCTIONS
INTERACTIONS
MANY-BODY PROBLEM
MODULATION
ONE-DIMENSIONAL CALCULATIONS
PHYSICAL PROPERTIES
STRONG INTERACTIONS
TWO-BODY PROBLEM
VARIATIONS
WEAK INTERACTIONS