期刊
PHYSICAL REVIEW LETTERS
卷 105, 期 26, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.265302
关键词
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资金
- European Union
- FWF
- DFG
- EPSRC
- Austrian Science Fund (FWF) [Z 118] Funding Source: researchfish
- Engineering and Physical Sciences Research Council [EP/E036473/1] Funding Source: researchfish
- EPSRC [EP/E036473/1] Funding Source: UKRI
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 approximate to 0.5h omega(perpendicular to) ( transverse oscillator eigenfrequency omega(perpendicular to)) 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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