Title
Dynamical response of ultracold interacting fermion-boson mixtures Dynamical response of ultracold interacting fermion-boson mixtures
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Amsterdam ,
Subject
Physics
Source (journal)
Physica: B: condensed matter. - Amsterdam
Volume/pages
454(2014) , p. 224-234
ISSN
0921-4526
ISI
000342682100038
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
We analyze the dynamical response of a ultracold binary gas mixture in the presence of strong boson-fermion couplings. Mapping the problem onto that of the optical response of a metal/semiconductor electronic degrees of freedom to electromagnetic perturbation we calculate the corresponding dynamic linear response susceptibility in the non-perturbative regimes of strong boson-fermion coupling using diagrammatic resummation technique as well as quantum Monte Carlo simulations. We evaluate the Bragg spectral function as well as the optical conductivity and find a pseudogap, which forms in certain parameter regimes. (C) 2014 Elsevier B.V. All rights reserved.
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