Perturbation theory of a superconducting 0-pi impurity quantum phase transition
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F15%3A10295323" target="_blank" >RIV/00216208:11320/15:10295323 - 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>
Alternative languages
Result language
angličtina
Original language name
Perturbation theory of a superconducting 0-pi 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 - pi 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
—
Czech description
—
Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BM - Solid-state physics and magnetism
OECD FORD branch
—
Result continuities
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
Others
Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Scientific Reports
ISSN
2045-2322
e-ISSN
—
Volume of the periodical
5
Issue of the periodical within the volume
Leden
Country of publishing house
GB - UNITED KINGDOM
Number of pages
6
Pages from-to
—
UT code for WoS article
000350473700015
EID of the result in the Scopus database
2-s2.0-84924705787