Tunable reentrant Kondo effect in quantum dots coupled to metal-superconducting hybrid reservoirs

0553606 - FZÚ 2022 RIV US eng J - Článek v odborném periodiku
Zalom, Peter - Novotný, T.
Tunable reentrant Kondo effect in quantum dots coupled to metal-superconducting hybrid reservoirs.
Physical Review B. Roč. 104, č. 3 (2021), č. článku 035437. ISSN 2469-9950. E-ISSN 2469-9969
Grant CEP: GA ČR GA19-13525S; GA MŠMT LTC19045
Výzkumná infrastruktura: e-INFRA CZ - 90140
Institucionální podpora: RVO:68378271
Klíčová slova: numerical renormalization-group * Josephson junction * quantum phase transitions
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 3.908, rok: 2021
Způsob publikování: Omezený přístup
https://doi.org/10.1103/PhysRevB.104.035437

We elaborate on concept of reentrant Kondo effect in quantum impurities/dots coupled to hybrid metal-semiconductor contacts. By noticing the equivalence of the originally suggested semiconducting arrangement to an analogous three-terminal quantum dot setup with a normal and two phase-biased superconducting leads introduced in our recent work, we put this effect into a new physical context. First, we identify the superconducting counterpart of the reentrant Kondo effect and, consequently, reveal its fragility with respect to an underlying doublet-singlet quantum phase transition induced by the particle-hole asymmetry of the reservoir densities of states. Furthermore, we analyze the experimental feasibility of observing the reentrant Kondo effect in its superconducting realization concluding that even present day experiments might see the onset of the reentrant behavior, but fully developed Kondo features cannot be reached due to the required vast separation of energy/temperature scales.
Trvalý link: http://hdl.handle.net/11104/0328410