Perturbation theory of a superconducting 0? impurity quantum phase transition

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F15%3A00452001" target="_blank" >RIV/68378271:_____/15:00452001 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1038/srep08821" target="_blank" >http://dx.doi.org/10.1038/srep08821</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/srep08821" target="_blank" >10.1038/srep08821</a>

Result language

angličtina

Original language name

Perturbation theory of a superconducting 0? impurity quantum phase transition

Original language description

A single-level quantum dot with Coulomb repulsion attached to two superconducting leads is studied via the perturbation expansion in the interaction strength. We use the Nambu formalism and the standard many-body diagrammatic representation of the impurity Green functions to formulate the Matsubara self-consistent perturbation expansion. We show that at zero temperature second order of the expansion in its spin-symmetric version yields a nearly perfect agreement with the numerically exact calculations for the position of the 0 ? phase boundary at which the Andreev bound states reach the Fermi energy as well as for the values of single-particle quantities in the 0-phase. We present results for phase diagrams, level occupation, induced local superconducting gap, Josephson current, and energy of the Andreev bound states with the precision surpassing any (semi)analytical approaches employed thus far.

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/GCP204%2F11%2FJ042" target="_blank" >GCP204/11/J042: Supercurrent and ac-Josephson effect in unconventional nanoscopic junctions</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2015

Confidentiality

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

Name of the periodical

Scientific Reports

ISSN

2045-2322

e-ISSN

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Volume of the periodical

5

Issue of the periodical within the volume

Mar

Country of publishing house

GB - UNITED KINGDOM

Number of pages

6

Pages from-to

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UT code for WoS article

000350473700015

EID of the result in the Scopus database

2-s2.0-84924705787