Anomalous Josephson current through a driven double quantum dot
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Anomalous Josephson current through a driven double quantum dot. / Ortega-Taberner, Carlos; Jauho, Antti-Pekka; Paaske, Jens.
I: Physical Review B, Bind 107, Nr. 11, 115165, 29.03.2023.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Anomalous Josephson current through a driven double quantum dot
AU - Ortega-Taberner, Carlos
AU - Jauho, Antti-Pekka
AU - Paaske, Jens
PY - 2023/3/29
Y1 - 2023/3/29
N2 - Josephson junctions based on quantum dots offer a convenient tunability by means of local gates. Here we analyze a Josephson junction based on a serial double quantum dot in which the two dots are individually gated by phase-shifted microwave tones of equal frequency. We calculate the time-averaged current across the junction and determine how the phase shift between the drives modifies the current-phase relation of the junction. Breaking particle-hole symmetry on the dots is found to give rise to a finite average anomalous Josephson current with phase bias between the superconductors fixed to zero. This microwave gated weak link thus realizes a tunable "Floquet v0 junction" with maximum critical current achieved for driving frequencies slightly off resonance with the subgap excitation energy. We provide numerical results supported by an analytical analysis for infinite superconducting gap and weak interdot coupling. We identify an interaction-driven 0-ir transition of anomalous Josephson current as a function of driving phase difference. Finally, we show that this junction can be tuned so as to provide for complete rectification of the time-averaged Josephson current-phase relation.
AB - Josephson junctions based on quantum dots offer a convenient tunability by means of local gates. Here we analyze a Josephson junction based on a serial double quantum dot in which the two dots are individually gated by phase-shifted microwave tones of equal frequency. We calculate the time-averaged current across the junction and determine how the phase shift between the drives modifies the current-phase relation of the junction. Breaking particle-hole symmetry on the dots is found to give rise to a finite average anomalous Josephson current with phase bias between the superconductors fixed to zero. This microwave gated weak link thus realizes a tunable "Floquet v0 junction" with maximum critical current achieved for driving frequencies slightly off resonance with the subgap excitation energy. We provide numerical results supported by an analytical analysis for infinite superconducting gap and weak interdot coupling. We identify an interaction-driven 0-ir transition of anomalous Josephson current as a function of driving phase difference. Finally, we show that this junction can be tuned so as to provide for complete rectification of the time-averaged Josephson current-phase relation.
KW - COHERENT MANIPULATION
KW - TRANSPORT
KW - STATES
KW - MOLECULES
KW - DIODE
U2 - 10.1103/PhysRevB.107.115165
DO - 10.1103/PhysRevB.107.115165
M3 - Journal article
VL - 107
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 11
M1 - 115165
ER -
ID: 346048036