Weakly interacting Bose gas in the one-dimensional limit

P. Krüger; S. Hofferberth; I. E. Mazets; I. Lesanovsky; J. Schmiedmayer

doi:10.1103/physrevlett.105.265302

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arXiv · 1012.3048

Weakly interacting Bose gas in the one-dimensional limit

P. Krüger·S. Hofferberth·I. E. Mazets·I. Lesanovsky·J. Schmiedmayer

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Abstract

We prepare a chemically and thermally one-dimensional (1d) quantum degenerate Bose gas in a single microtrap. We introduce a new interferometric method to distinguish the quasicondensate fraction of the gas from the thermal cloud at finite temperature. We reach temperatures down to $kT\approx 0.5\hbarω_\perp$ (transverse oscillator eigenfrequency $ω_\perp$) when collisional thermalization slows down as expected in 1d. At the lowest temperatures the transverse momentum distribution exhibits a residual dependence on the line density $n_{1d}$, characteristic for 1d systems. For very low densities the approach to the transverse single particle ground state is linear in $n_{1d}$.

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P. Krüger, S. Hofferberth, I. E. Mazets, I. Lesanovsky, J. Schmiedmayer. 2010-12-14. Weakly interacting Bose gas in the one-dimensional limit. https://doi.org/10.1103/physrevlett.105.265302

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