Kondo effect and Josephson current through a quantum dot between two superconductors

Mahn Soo Choi; Minchul Lee; Kicheon Kang; W. Belzig

doi:10.1103/PhysRevB.70.020502

Kondo effect and Josephson current through a quantum dot between two superconductors

Mahn Soo Choi, Minchul Lee, Kicheon Kang, W. Belzig

Department of Physics

Research output: Contribution to journal › Article › peer-review

155 Citations (Scopus)

Abstract

We investigate the supercurrent through a quantum dot for the whole range of couplings using the numerical renormalization group method. We find that the Josephson current switches abruptly from a π- to a 0-phase as the coupling increases. At intermediate couplings the total spin in the ground state depends on the phase difference between the two superconductors. Our numerical results can explain the crossover in the conductance observed experimentally by Buitelaar et al. [Phys. Rev. Lett. 89, 256801 (2002)].

Original language	English
Article number	020502
Pages (from-to)	020502-1-020502-4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	70
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.70.020502
Publication status	Published - 2004 Jul

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1103/PhysRevB.70.020502

Cite this

@article{72ce01252e7e4607917da7739f9b5cc4,

title = "Kondo effect and Josephson current through a quantum dot between two superconductors",

abstract = "We investigate the supercurrent through a quantum dot for the whole range of couplings using the numerical renormalization group method. We find that the Josephson current switches abruptly from a π- to a 0-phase as the coupling increases. At intermediate couplings the total spin in the ground state depends on the phase difference between the two superconductors. Our numerical results can explain the crossover in the conductance observed experimentally by Buitelaar et al. [Phys. Rev. Lett. 89, 256801 (2002)].",

author = "Choi, {Mahn Soo} and Minchul Lee and Kicheon Kang and W. Belzig",

note = "Funding Information: We thank C. Sch{\"o}nenberger for remarks on Ref. and acknowledge discussions with C. Bruder, M. Gr{\"a}ber, and T. Kontos. This work was supported by the SKORE-A, the eSSC at Postech, the NCCR Nanoscience, and the Swiss NSF.",

year = "2004",

month = jul,

doi = "10.1103/PhysRevB.70.020502",

language = "English",

volume = "70",

pages = "020502--1--020502--4",

journal = "Physical Review B-Condensed Matter",

issn = "1098-0121",

publisher = "American Institute of Physics",

number = "2",

}

TY - JOUR

T1 - Kondo effect and Josephson current through a quantum dot between two superconductors

AU - Choi, Mahn Soo

AU - Lee, Minchul

AU - Kang, Kicheon

AU - Belzig, W.

N1 - Funding Information: We thank C. Schönenberger for remarks on Ref. and acknowledge discussions with C. Bruder, M. Gräber, and T. Kontos. This work was supported by the SKORE-A, the eSSC at Postech, the NCCR Nanoscience, and the Swiss NSF.

PY - 2004/7

Y1 - 2004/7

N2 - We investigate the supercurrent through a quantum dot for the whole range of couplings using the numerical renormalization group method. We find that the Josephson current switches abruptly from a π- to a 0-phase as the coupling increases. At intermediate couplings the total spin in the ground state depends on the phase difference between the two superconductors. Our numerical results can explain the crossover in the conductance observed experimentally by Buitelaar et al. [Phys. Rev. Lett. 89, 256801 (2002)].

AB - We investigate the supercurrent through a quantum dot for the whole range of couplings using the numerical renormalization group method. We find that the Josephson current switches abruptly from a π- to a 0-phase as the coupling increases. At intermediate couplings the total spin in the ground state depends on the phase difference between the two superconductors. Our numerical results can explain the crossover in the conductance observed experimentally by Buitelaar et al. [Phys. Rev. Lett. 89, 256801 (2002)].

UR - http://www.scopus.com/inward/record.url?scp=42749098941&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.70.020502

DO - 10.1103/PhysRevB.70.020502

M3 - Article

AN - SCOPUS:42749098941

SN - 1098-0121

VL - 70

SP - 020502-1-020502-4

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

IS - 2

M1 - 020502

ER -

Kondo effect and Josephson current through a quantum dot between two superconductors

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this