Quantum dot attached to superconducting leads: Relation between symmetric and asymmetric coupling

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10362636" target="_blank" >RIV/00216208:11320/17:10362636 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1103/PhysRevB.95.195114" target="_blank" >http://dx.doi.org/10.1103/PhysRevB.95.195114</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevB.95.195114" target="_blank" >10.1103/PhysRevB.95.195114</a>

Result language
angličtina
Original language name
Quantum dot attached to superconducting leads: Relation between symmetric and asymmetric coupling
Original language description
We study the Anderson single-level quantum dot attached to two BCS superconducting leads with the same gap size. We reveal that a system with asymmetric tunnel coupling to the leads (Gamma(L) not equal Gamma(R)) can be related to the symmetric system with the same net coupling strength Gamma=Gamma(L) + Gamma(R). Surprisingly, it is the symmetric case which is the most general, meaning that all physical quantities in the case of asymmetric coupling are fully determined by the symmetric ones. We give ready-to-use conversion formulas for the 0-pi phase transition boundary, on-dot quantities, and the Josephson current and illustrate them on the NRG results of Oguri, Tanaka and Bauer [Phys. Rev. B 87, 075432 (2013)] for the three-terminal setup. We apply our theory to the recent 0-p transition measurement of Delagrange et al. [Phys. Rev. B 93, 195437 (2016)] and determine the asymmetry of the experimental setup from the measured transition width. Finally, we establish that the widely assumed Kondo "universality" of physical quantities depending only on the ratio of the Kondo temperature and the superconducting gap T-K/Delta cannot hold for asymmetric junctions.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project
<a href="/en/project/GA16-19640S" target="_blank" >GA16-19640S: Vibrational effects in nonequilibrium electronic transport through nanosystems</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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