Document Type

Article

Publication Date

Spring 4-5-2012

Publication Title

Physical Review Letters

ISSN

0031-9007

Volume

108

Issue

14

First Page

145305-1

Last Page

145305-5

DOI

10.1103/PhysRevLett.108.145305

Abstract

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 85Rb 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 85Rb 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.

Comments

Published as "Measurements of Tan’s Contact in an Atomic Bose-Einstein Condensate" (http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.108.145305)

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