Perturbation theory for an Anderson quantum dot asymmetrically attached to two superconducting leads

Kód výsledku v IS VaVaI

RIV/68378271:_____/16:00465518 - isvavai.cz

Nalezeny alternativní kódy

RIV/00216208:11320/16:10321714

Výsledek na webu

http://dx.doi.org/10.1103/PhysRevB.93.024523

DOI - Digital Object Identifier

10.1103/PhysRevB.93.024523

Jazyk výsledku

angličtina

Název v původním jazyce

Perturbation theory for an Anderson quantum dot asymmetrically attached to two superconducting leads

Popis výsledku v původním jazyce

Self-consistent perturbation expansion up to the second order in the interaction strength is used to study a single-level quantum dot with local Coulomb repulsion attached asymmetrically to two generally different superconducting leads. At zero temperature and a wide range of other parameters, the spin-symmetric version of the expansion yields excellent results for the position of the zeropi impurity quantum phase transition boundary and Josephson current together with the energy of Andreev bound states in the 0 phase as confirmed by numerical calculations using the numerical renormalization group method. We analytically prove that the method is charge conserving as well as thermodynamically consistent. Explicit formulas for the position of the zero-pi phase boundary are presented for the Hartree-Fock approximation as well as for its variant called generalized atomic limit.

Název v anglickém jazyce

Perturbation theory for an Anderson quantum dot asymmetrically attached to two superconducting leads

Popis výsledku anglicky

Self-consistent perturbation expansion up to the second order in the interaction strength is used to study a single-level quantum dot with local Coulomb repulsion attached asymmetrically to two generally different superconducting leads. At zero temperature and a wide range of other parameters, the spin-symmetric version of the expansion yields excellent results for the position of the zeropi impurity quantum phase transition boundary and Josephson current together with the energy of Andreev bound states in the 0 phase as confirmed by numerical calculations using the numerical renormalization group method. We analytically prove that the method is charge conserving as well as thermodynamically consistent. Explicit formulas for the position of the zero-pi phase boundary are presented for the Hartree-Fock approximation as well as for its variant called generalized atomic limit.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

—

Projekt

GJ15-08740Y: Generování spinových proudů na femtosekundové časové škále

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Physical Review B

ISSN

2469-9950

e-ISSN

—

Svazek periodika

93

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

18

Strana od-do

—

Kód UT WoS článku

000369219600003

EID výsledku v databázi Scopus

2-s2.0-85000402242