Magnetic-field-induced transition in a quantum dot coupled to a superconductor
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Magnetic-field-induced transition in a quantum dot coupled to a superconductor. / Corral, A. Garcia; van Zanten, D. M. T.; Franke, K. J.; Courtois, H.; Florens, S.; Winkelmann, C. B.
I: Physical Review Research, Bind 2, Nr. 1, 012065, 16.03.2020.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Magnetic-field-induced transition in a quantum dot coupled to a superconductor
AU - Corral, A. Garcia
AU - van Zanten, D. M. T.
AU - Franke, K. J.
AU - Courtois, H.
AU - Florens, S.
AU - Winkelmann, C. B.
PY - 2020/3/16
Y1 - 2020/3/16
N2 - The magnetic moment of a quantum dot can be screened by its coupling to a superconducting reservoir, depending on the hierarchy of the superconducting gap and the relevant Kondo scale. This screening-unscreening transition can be driven by electrostatic gating, tunnel coupling, and, as we demonstrate here, a magnetic field. We perform high-resolution spectroscopy of subgap excitations near the screening-unscreening transition of asymmetric superconductor-quantum dot-superconductor (S-QD-S) junctions formed by the electromigration technique. Our measurements reveal a re-entrant phase boundary determined by the competition between Zeeman energy and gap reduction with magnetic field. We further track the evolution of the phase transition with increasing temperature, which is also evinced by thermal replicas of subgap states.
AB - The magnetic moment of a quantum dot can be screened by its coupling to a superconducting reservoir, depending on the hierarchy of the superconducting gap and the relevant Kondo scale. This screening-unscreening transition can be driven by electrostatic gating, tunnel coupling, and, as we demonstrate here, a magnetic field. We perform high-resolution spectroscopy of subgap excitations near the screening-unscreening transition of asymmetric superconductor-quantum dot-superconductor (S-QD-S) junctions formed by the electromigration technique. Our measurements reveal a re-entrant phase boundary determined by the competition between Zeeman energy and gap reduction with magnetic field. We further track the evolution of the phase transition with increasing temperature, which is also evinced by thermal replicas of subgap states.
KW - STATES
U2 - 10.1103/PhysRevResearch.2.012065
DO - 10.1103/PhysRevResearch.2.012065
M3 - Journal article
VL - 2
JO - Physical Review Research
JF - Physical Review Research
SN - 2643-1564
IS - 1
M1 - 012065
ER -
ID: 255160260