Failure of the mean-field description of magnetic fluctuations in the superconducting quantum dot

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F22%3A00559628" target="_blank" >RIV/68378271:_____/22:00559628 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0333617" target="_blank" >https://hdl.handle.net/11104/0333617</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/9.0000267" target="_blank" >10.1063/9.0000267</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Failure of the mean-field description of magnetic fluctuations in the superconducting quantum dot

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Failure of the mean-field description of magnetic fluctuations in the superconducting quantum dot

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

AIP Advances

ISSN

2158-3226

e-ISSN

2158-3226

Svazek periodika

12

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

6

Strana od-do

035139

Kód UT WoS článku

000827492200006

EID výsledku v databázi Scopus

2-s2.0-85126720578