Stahl C, Eckstein M (2021)
Publication Type: Journal article
Publication year: 2021
Book Volume: 103
Article Number: 035116
Journal Issue: 3
DOI: 10.1103/PhysRevB.103.035116
We investigate the dynamics of superconducting fluctuations in the attractive three-dimensional Hubbard model after a quench from the disordered phase to the ordered regime. While the long-time evolution is well understood in terms of dissipative time-dependent Ginzburg-Landau models with unstable potentials, early times are more demanding due to the inseparable dynamics of the pairing fluctuations and the electronic quasiparticles. Our simulation using the time-dependent fluctuation exchange approximation treats both degrees of freedom on the same footing and reveals a nonthermal electronic regime causing a nonmonotonous growth of the fluctuations. This feature is not directly captured by the Ginzburg-Landau theory but nevertheless remains observable beyond the thermalization time of the electrons. We further explore how the growth of the order parameter fluctuations leads to an opening of a pseudogap in the electronic spectrum and identify Andreev reflections as the dominant mechanism behind the gap opening.
APA:
Stahl, C., & Eckstein, M. (2021). Electronic and fluctuation dynamics following a quench to the superconducting phase. Physical Review B, 103(3). https://doi.org/10.1103/PhysRevB.103.035116
MLA:
Stahl, Christopher, and Martin Eckstein. "Electronic and fluctuation dynamics following a quench to the superconducting phase." Physical Review B 103.3 (2021).
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