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Quench dynamics of an ultracold Fermi gas in the BCS regime : Spectral properties and confinement-induced breakdown of the Higgs mode

Title data

Hannibal, S. ; Kettmann, P. ; Croitoru, Mikhail D. ; Vagov, Alexei ; Axt, Vollrath M. ; Kuhn, Tilmann:
Quench dynamics of an ultracold Fermi gas in the BCS regime : Spectral properties and confinement-induced breakdown of the Higgs mode.
In: Physical Review A. Vol. 91 (2015) Issue 4 . - Art.Nr. 043630, 11 S..
ISSN 1094-1622
DOI: https://doi.org/10.1103/PhysRevA.91.043630

Project information

Project financing: Supported by the BELSPO Back to Belgium Grant.

Abstract in another language

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. A characteristic feature is 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 sub-band minimum, and off-resonant systems can be well understood and traced back to the system and geometry parameters.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Higgs amplitude mode; ultracold confined Fermi gas; BCS regime; quench dynamics
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 03 Nov 2017 09:19
Last Modified: 04 Dec 2020 13:31
URI: https://eref.uni-bayreuth.de/id/eprint/40268