Bragg spectroscopy of a Bose-Einstein condensate
J. Stenger, S. Inouye, A.P. Chikkatur, D.M. Stamper--Kurn, D.E., Pritchard, and W. Ketterle
TL;DR
This paper demonstrates how Bragg spectroscopy can precisely measure properties like mean-field energy, coherence length, and dynamic structure factor of a Bose-Einstein condensate, revealing its intrinsic quantum characteristics.
Contribution
It introduces high-resolution Bragg spectroscopy as a tool for detailed spectroscopic analysis of Bose-Einstein condensates, including measurements of coherence length and dynamic structure factor.
Findings
Measured mean-field energy and momentum uncertainty
Confirmed coherence length equals condensate size
Showed Bragg spectroscopy's capability to probe dynamic structure factor
Abstract
Properties of a Bose-Einstein condensate were studied by stimulated, two-photon Bragg scattering. The high momentum and energy resolution of this method allowed a spectroscopic measurement of the mean-field energy and of the intrinsic momentum uncertainty of the condensate. The coherence length of the condensate was shown to be equal to its size. Bragg spectroscopy can be used to determine the dynamic structure factor over a wide range of energy and momentum transfers.
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