Zobrazeno 1 - 10
of 570
pro vyhledávání: '"Tempere, J."'
Publikováno v:
Condensed Matter 8, 42 (2023)
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
Externí odkaz:
http://arxiv.org/abs/2306.13393
Publikováno v:
New J. Phys. 25, 06301 (2023)
We consider collective excitations in the superfluid state of Fermi condensed charged gases. The dispersion and damping of collective excitations at nonzero temperatures are examined, and the coexistence and interaction of different branches of colle
Externí odkaz:
http://arxiv.org/abs/2208.09757
We study the plasma branch of an homogeneous three-dimensional electron gas in an $s$-wave superconducting state. We focus on the regime where the plasma frequency $\omega_p$ is comparable to the gap $\Delta$, which is experimentally realized in cupr
Externí odkaz:
http://arxiv.org/abs/2201.11421
Studying the collective pairing phenomena in a two-component Fermi gas, we predict the appearance near the transition temperature $T_c$ of a well-resolved collective mode of quadratic dispersion. The mode is visible both above and below $T_c$ in the
Externí odkaz:
http://arxiv.org/abs/2103.05733
We study the signatures of the collective modes of a superfluid Fermi gas in its linear response functions for the order-parameter and density fluctuations in the Random Phase Approximation (RPA). We show that a resonance associated to the Popov-Andr
Externí odkaz:
http://arxiv.org/abs/1912.08898
Optical conductivity of an interacting polaron gas is calculated within an extended random phase approximation which takes into account mixing of collective excitations of the electron gas with LO phonons. This mixing is important for the optical res
Externí odkaz:
http://arxiv.org/abs/1912.03062
Publikováno v:
Journal of Low Temperature Physics 196 (2018) 102-110
The Anderson-Bogoliubov branch of collective excitations in a condensed Fermi gas is treated using the effective bosonic action of Gaussian pair fluctuations. The spectra of collective excitations are treated for finite temperature and momentum throu
Externí odkaz:
http://arxiv.org/abs/1912.03059
Publikováno v:
New Journal of Physics 21, 113043 (2019)
The Leggett collective excitations for a two-band Fermi gas with s-wave pairing and Josephson interband coupling in the BCS-BEC crossover at finite temperatures are investigated within the Gaussian pair fluctuation approach. Eigenfrequencies and damp
Externí odkaz:
http://arxiv.org/abs/1908.11795
Akademický článek
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Publikováno v:
Journal of Superconductivity and Novel Magnetism 32, 2739-2744 (2019)
The dielectric function method for superconductivity has been applied to SrTiO$_{3}$ accounting for the non-parabolic dispersion of charge carriers in the conduction band and for the dispersion of optical phonons based on density functional theory ca
Externí odkaz:
http://arxiv.org/abs/1811.11656