Seminar über Theoretische Festkörperphysik |
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| Speaker: | Mikhail Feigel'man |
Date: | 29/09/2025 14:00 |
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| Where: | 10.01, Geb. 30.23, CS; and Zoom |
Affiliation: | CENN Nanocenter (Ljubljana, Slovenia) |
| Host: | Igor Poboiko |
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Abstract
Recent measurement of plasmon resonance spectra in amorphous InOx films revealed several new features of strongly disordered superconductors: high density of low-energy excitations of unknown origin, non-monotonic temperature dependence of the resonance quality factor and unexpected first-order-like transition to insulating state with increase of disorder. I will review these experiments [1,2] as well as relevant theory [2,3] and then will discuss the possible relevance of these results for granular aluminum films.
[1] T. Charpentier, D. Perconte, S. Léger, K.R. Amin, F. Blondelle, F.Gay, O. Buisson, L. Ioffe, A. Khvalyuk, I.Poboiko, M. Feigel’man, N. Roch, B. Sacépé, First-order quantum breakdown of superconductivity in an amorphous superconductor. Nat. Phys. 21, 104 (2025)
[2] A.V. Khvalyuk, T. Charpentier, N. Roch, B. Sacépé, M.V. Feigel'man, Near power-law temperature dependence of the superfluid stiffness in strongly disordered superconductors, Phys. Rev. B 109, 144501 (2024)
[3] I. Poboiko, M.Feigel'man, Mean-field theory of first-order quantum superconductor-insulator transition, SciPost Phys. 17, 066 (2024)