Supercurrent in a Double Quantum Dot

TY - JOUR

T1 - Supercurrent in a Double Quantum Dot

AU - Estrada Saldaña, J. C.

AU - Vekris, A.

AU - Steffensen, G.

AU - Žitko, R.

AU - Krogstrup, P.

AU - Paaske, J.

AU - Grove-Rasmussen, K.

AU - Nygård, J.

N1 - [Qdev]

PY - 2018/12/20

Y1 - 2018/12/20

N2 - We demonstrate the Josephson effect in a serial double quantum dot defined in a nanowire with epitaxial superconducting leads. The supercurrent stability diagram adopts a honeycomb pattern. We observe sharp discontinuities in the magnitude of the critical current, $I_c$, as a function of dot occupation, related to doublet to singlet ground state transitions. Detuning of the energy levels offers a tuning knob for $I_c$, which attains a maximum at zero detuning. The consistency between experiment and theory indicates that our device is a faithful realization of the two-impurity Anderson model.

AB - We demonstrate the Josephson effect in a serial double quantum dot defined in a nanowire with epitaxial superconducting leads. The supercurrent stability diagram adopts a honeycomb pattern. We observe sharp discontinuities in the magnitude of the critical current, $I_c$, as a function of dot occupation, related to doublet to singlet ground state transitions. Detuning of the energy levels offers a tuning knob for $I_c$, which attains a maximum at zero detuning. The consistency between experiment and theory indicates that our device is a faithful realization of the two-impurity Anderson model.

KW - Nanowires

KW - Quantum Transport

KW - Josephson effect

U2 - 10.1103/PhysRevLett.121.257701

DO - 10.1103/PhysRevLett.121.257701

M3 - Letter

C2 - 30608792

SN - 0031-9007

VL - 121

JO - Physical Review Letters

JF - Physical Review Letters

IS - 25

M1 - 112010

ER -