Spin-symmetric solution of an interacting quantum dot attached to superconducting leads: Andreev states and the 0-pi transition

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F16%3A00467075" target="_blank" >RIV/68378271:_____/16:00467075 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11320/16:10327268

Result on the web

<a href="http://dx.doi.org/10.1140/epjb/e2016-70299-7" target="_blank" >http://dx.doi.org/10.1140/epjb/e2016-70299-7</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1140/epjb/e2016-70299-7" target="_blank" >10.1140/epjb/e2016-70299-7</a>

Result language

angličtina

Original language name

Spin-symmetric solution of an interacting quantum dot attached to superconducting leads: Andreev states and the 0-pi transition

Original language description

Behavior of Andreev gap states in a quantum dot with Coulomb repulsion symmetrically attached to superconducting leads is studied via the perturbation expansion in the interaction strength. We find the exact asymptotic form of the spin-symmetric solution for the Andreev states continuously approaching the Fermi level. We thereby derive a critical interaction at which the Andreev states at zero temperature merge at the Fermi energy, being the upper bound for the 0-pi transition. We show that the spin-symmetric solution becomes degenerate beyond this interaction, in the pi phase, and the Andreev states do not split unless the degeneracy is lifted. We further demonstrate that the degeneracy of the spin-symmetric state extends also into the 0 phase in which the solutions with zero and non-zero frequencies of the Andreev states may coexist.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BM - Solid-state physics and magnetism

OECD FORD branch

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Project

<a href="/en/project/GA15-14259S" target="_blank" >GA15-14259S: Quantum criticality in strongly correlated electron systems: Consistent description of spectral and thermodynamic properties</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

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

Name of the periodical

European Physical Journal B

ISSN

1434-6028

e-ISSN

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Volume of the periodical

89

Issue of the periodical within the volume

9

Country of publishing house

DE - GERMANY

Number of pages

12

Pages from-to

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UT code for WoS article

000383156000001

EID of the result in the Scopus database

2-s2.0-84987932319