Higgs mode in the quench dynamics of a confined ultracold Fermi gas in the BCS regime

The Higgs amplitude mode of the order parameter of an ultracold confined Fermi gas in the BCS regime after a quench of the coupling constant is analyzed theoretically. Characteristic features are a damped oscillation which at a certain transition time changes into a rather irregular dynamics. We com...

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Bibliographic Details
Main Authors Hannibal, S, Kettmann, P, Croitoru, M. D, Vagov, A. V, Axt, V. M, Kuhn, T
Format Journal Article
LanguageEnglish
Published 08.12.2014
Subjects
Physics - Quantum Gases
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Summary:The Higgs amplitude mode of the order parameter of an ultracold confined Fermi gas in the BCS regime after a quench of the coupling constant is analyzed theoretically. Characteristic features are a damped oscillation which at a certain transition time changes into a rather irregular dynamics. We compare the numerical solution of the full set of nonlinear equations of motion for the normal and anomalous Bogoliubov quasiparticle excitations with a linearized approximation. In doing so the transition time as well as the difference between resonant systems, i.e., systems where the Fermi energy is close to a subband minimum, and off-resonant systems can be well understood and traced back to the system and geometry parameters.
DOI:10.48550/arxiv.1412.2591