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Failure of the mean-field description of magnetic fluctuations in the superconducting quantum dot
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SYSNO ASEP 0559628 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Failure of the mean-field description of magnetic fluctuations in the superconducting quantum dot Author(s) Janiš, Václav (FZU-D) RID, ORCID, SAI
Yan, Jiawei (FZU-D) ORCIDNumber of authors 2 Article number 035139 Source Title AIP Advances. - : AIP Publishing
Roč. 12, č. 3 (2022)Number of pages 6 s. Language eng - English Country US - United States Keywords mean-field ; magnetic fluctuations ; thermal fluctuations ; dynamical renormalization Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects LTC19045 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA19-13525S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support FZU-D - RVO:68378271 UT WOS 000827492200006 EID SCOPUS 85126720578 DOI 10.1063/9.0000267 Annotation The zero-temperature physics of interacting quantum dots attached to superconducting leads is now well understood. The overall qualitative picture is obtained from the static mean-field approximation. The situation drastically changes at non-zero temperatures. No reliable solutions apart from numerical simulations exist there. We show that any static mean-field approximation fails at non-zero temperatures since magnetic fluctuations induce dynamical corrections that lead to broadening of the in-gap state energies to energy bands. Spin-symmetric equilibrium state at non-zero temperatures is unstable with respect to magnetic fluctuations and the zero magnetic field can be reached only as a weak limit of the spin-polarized solution like in a magnetically ordered phase. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2023 Electronic address https://hdl.handle.net/11104/0333617
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