Статья

Measurements of Tan’s Contact in an Atomic Bose-Einstein Condensate

R. J. WildJILA, National Institute of Standards and Technology, Boulder, Colorado 80309-0440, USAPhilip MakotynJILA, National Institute of Standards and Technology and University of Colorado, and Department of Physics, Boulder, Colorado 80309-0440, USAJuan Miguel Rey PinoJILA, National Institute of Standards and Technology and University of Colorado, and Department of Physics, Boulder, Colorado 80309-0440, USAEric CornellJILA, National Institute of Standards and Technology and University of Colorado, and Department of Physics, Boulder, Colorado 80309-0440, USAD. S. JinJILA, National Institute of Standards and Technology and University of Colorado, and Department of Physics, Boulder, Colorado 80309-0440, USA

2012en

ABI

Аннотация

A powerful set of universal relations, centered on a quantity called the contact, connects the strength of short-range two-body correlations to the thermodynamics of a many-body system with zero-range interactions. We report on measurements of the contact, using rf spectroscopy, for an (85)Rb atomic Bose-Einstein condensate (BEC). For bosons, the fact that contact spectroscopy can be used to probe the gas on short time scales is useful given the decreasing stability of BECs with increasing interactions. A complication is the added possibility, for bosons, of three-body interactions. In investigating this issue, we have located an Efimov resonance for (85)Rb atoms with loss measurements and thus determined the three-body interaction parameter. In our contact spectroscopy, in a region of observable beyond-mean-field effects, we find no measurable contribution from three-body physics.

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Идентификаторы

DOI: 10.1103/physrevlett.108.145305

Цитирования и источники

Цитирований: 5Использованных источников: 0

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