Speaker
Prof.
Clemens Winkelmann
(Grenoble)
Description
We report on the realization of a single-electron source,
where current is transported through a single-level quantum
dot (Q) tunnel coupled to two superconducting leads (S).
When driven with an ac gate voltage, the experiment
demonstrates electron turnstile operation. Compared to the
more conventional superconductor–normal-metal–superconductor
turnstile, our superconductor–quantum-dot– superconductor
device presents a number of novel properties, including
higher immunity to the unavoidable presence of
nonequilibrium quasiparticles in superconducting leads.
Moreover, we demonstrate its ability to deliver electrons
with a very narrow energy distribution. In the second part
of the talk I will discuss possible effects that go beyond
the semi-classical picture, associated to the quantum
dynamics of the quantum dot level coupled to the
semi-continuum in the leads' DOS.
Primary author
Prof.
Clemens Winkelmann
(Grenoble)
