Low-Lying Collective Excitations of Superconductors and Charged Superfluids - Fermions Fortement Corrélés
Article Dans Une Revue Condensed Matter Année : 2023

Low-Lying Collective Excitations of Superconductors and Charged Superfluids

Excitations de basse énergie dans les supraconducteurs et les superfluides chargés

Résumé

We investigate theoretically the momentum-dependent frequency and damping of low-lying collective excitations of superconductors and charged superfluids in the BCS–BEC crossover regime. The study is based on the Gaussian pair-and-density fluctuation method for the propagator of Gaussian fluctuations of the pair and density fields. Eigenfrequencies and damping rates are determined in a mutually consistent nonperturbative way as complex poles of the fluctuation propagator. Particular attention is paid to new features with respect to preceding theoretical studies, which were devoted to collective excitations of superconductors in the far BCS regime. We find that at a sufficiently strong coupling, new branches of collective excitations appear, which manifest different behavior as functions of the momentum and the temperature.
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Dates et versions

hal-04207284 , version 1 (14-11-2023)

Identifiants

Citer

Serghei Klimin, Jacques Tempere, Hadrien Kurkjian. Low-Lying Collective Excitations of Superconductors and Charged Superfluids. Condensed Matter, 2023, 8 (2), pp.42. ⟨10.3390/condmat8020042⟩. ⟨hal-04207284⟩
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