Transient transport spectroscopy of an interacting quantum dot proximized by a superconductor: Charge and heat currents after a switch
Lara C. Ortmanns, Janine Splettstoesser, Maarten R. Wegewijs
DOI 10.1103/PhysRevB.108.085426 · Physical Review B
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Abstract
We analyze the time evolution of a quantum dot which is proximized by a large-gap superconductor and weakly probed using the charge and heat currents into a wide-band metal electrode. We map out the full time dependence of these currents after initializing the system by a switch. We find that due to the proximity effect there are two simple yet distinct switching procedures which initialize a nonstationary mixture of the gate-voltage-dependent eigenstates of the proximized quantum dot. We find in particular that the ensuing time-dependent heat current is a sensitive two-particle probe of the interplay of strong Coulomb interaction and induced superconducting pairing. The pairing can lead to a suppression of charge and heat current decay which we analyze in detail. The analysis of the results makes crucial use of analytic formulas obtained using fermionic duality, a “dissipative symmetry” of master equations describing this class of open systems.
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