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TT: Fachverband Tiefe Temperaturen

TT 22: Quantum Dots, Quantum Wires, Point Contacts

TT 22.8: Vortrag

Dienstag, 17. März 2020, 11:30–11:45, HSZ 201

Pair-amplitude dynamics in superconductor-quantum dot hybrids — •Mathias Kamp and Björn Sothmann — Theoretische Physik, Universität Duisburg-Essen and CENIDE, D-47048 Duisburg, Germany

Electromagnetic pulses in the THz regime have recently been used to excite oscillations of the order parameter in bulk superconductors [1]. These oscillations can be understood as a collective precession of the Anderson pseudospin and are linked to the Higgs amplitude mode of the order parameter.
Here, we consider a superconductor-quantum dot hybrid driven out of equilibrium by a temperature and phase bias. We investigate the dynamics of the proximity-induced pair amplitude on the dot after both a quench and under periodic driving of system parameters. We find that the system can exhibit coherent oscillations of the pair amplitude and link them to the time- dependent charge and heat currents through the system.

[1] Matsunaga et al., Science 345, 1145 (2014).