Sideband Rabi spectroscopy of finite-temperature trapped Bose gases

Allard, Baptiste and Fadel, Matteo and Schmied, Roman and Treutlein, Philipp. (2016) Sideband Rabi spectroscopy of finite-temperature trapped Bose gases. Physical Review A , 93 (4). 043624.

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Official URL: http://edoc.unibas.ch/52750/

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We use Rabi spectroscopy to explore the low-energy excitation spectrum of a finite-temperature Bose gas of rubidium atoms across the phase transition to a Bose-Einstein condensate (BEC). To record this spectrum, we coherently drive the atomic population between two spin states. A small relative displacement of the spin-specific trapping potentials enables sideband transitions between different motional states. The intrinsic nonlinearity of the motional spectrum, mainly originating from two-body interactions, makes it possible to resolve and address individual excitation lines. Together with sensitive atom counting, this constitutes a feasible technique to count single excited atoms of a BEC and to determine the temperature of nearly pure condensates. As an example, we show that for a nearly pure BEC of N=800 atoms the first excited state has a population of less than five atoms, corresponding to an upper bound on the temperature of 30nK.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentelle Nanophysik (Treutlein)
UniBasel Contributors:Treutlein, Philipp and Allard, Baptiste and Fadel, Matteo and Schmied, Roman
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:15 Feb 2017 13:32
Deposited On:15 Feb 2017 13:32

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