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Superfluid-insulator transition in Fermi-Bose mixtures and the orthogonality catastrophe

Refael, G. and Demler, E. (2008) Superfluid-insulator transition in Fermi-Bose mixtures and the orthogonality catastrophe. Physical Review B, 77 (14). Art. No. 144511. ISSN 1098-0121. doi:10.1103/PhysRevB.77.144511.

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The superfluid-insulator transition of bosons is strongly modified by the presence of fermions. Through an imaginary-time path-integral approach, we derive the self-consistent mean-field transition line, and account for both the static and dynamic screening effects of the fermions. We find that an effect akin to the fermionic orthogonality catastrophe, arising from the fermionic screening fluctuations, suppresses superfluidity. We analyze this effect for various mixture parameters and temperatures, and consider possible signatures of the orthogonality-catastrophe effect in other measurables of the mixture.

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Additional Information:©2008 The American Physical Society. (Received 21 December 2007; revised 29 February 2008; published 10 April 2008) We gratefully acknowledge useful discussions with E. Altman, H.P. Büchler, I. Bloch, T. Esslinger, W. Hofstetter, M. Inguscio, W. Ketterle, and R. Sensarma. This work was supported by AFOSR, DARPA, Harvard-MIT CUA, and the NSF Grant No. DMR-0705472.
Subject Keywords:boson systems; fermion systems; superfluidity
Issue or Number:14
Record Number:CaltechAUTHORS:REFprb08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10085
Deposited By: Archive Administrator
Deposited On:11 Apr 2008
Last Modified:08 Nov 2021 21:04

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