Momentum-resolved study of an array of one-dimensional strongly phase-fluctuating Bose gases

Year: 2011

Authors: Fabbri N., Clément D., Fallani L., Fort C., Inguscio M.

Autors Affiliation: European Laboratory for Non linear Spectroscopy (LENS) and Dipartimento di Fisica e Astronomia, Universita di Firenze; Istituto Nazionale di Ottica (INO-CNR), Sezione Sesto Fiorentino; Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia UdR di Firenze

Abstract: We investigate the coherence properties of an array of one-dimensional Bose gases with short-scale phase fluctuations. The momentum distribution is measured using Bragg spectroscopy, and an effective coherence length of the whole ensemble is defined. In addition, we propose and demonstrate that time-of-flight absorption imaging can be used as a simple probe to directly measure the coherence length of one-dimensional gases in the regime where phase fluctuations are strong. This method is suitable for future studies such as investigating the effect of disorder on the phase coherence.


Volume: 83 (3)      Pages from: 031604  to: 031604

More Information: We thank T. Giamarchi, A. Iucci, and M. Zvonarev for fruitful discussions. This work has been supported by MIUR PRIN 2007, Ente Cassa di Risparmio di Firenze, DISQUA Project from European Research Council, and the DQS EuroQUAM project from ESF. D. C. acknowledges support of a Marie Curie Intra-European Grant.
KeyWords: Absorption imaging; Bose gas; Bragg spectroscopy; Coherence lengths; Coherence properties; Momentum distributions; One-dimensional Bose Gases; Phase coherence; Phase fluctuation; Time of flight, Bosons
DOI: 10.1103/PhysRevA.83.031604

Citations: 46
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