Coherent photon assisted cotunneling in a Coulomb blockade device
Karsten Flensberg (Danish Institute of Fundamental Metrology)
TL;DR
This paper investigates how time-dependent potentials induce photon-assisted cotunneling in Coulomb blockade devices, deriving expressions for tunneling currents and highlighting cases where this process dominates transport.
Contribution
It provides a non-perturbative formula for tunneling current and a perturbative approach for photon-assisted cotunneling under oscillating potentials.
Findings
Photon-assisted cotunneling can dominate transport in Coulomb blockade devices.
Derived a general non-perturbative expression for tunneling current.
Provided a perturbative expression specifically for photon-assisted cotunneling.
Abstract
We study cotunneling in a double junction Coulomb blockade device under the influence of time dependent potentials. It is shown that the ac-bias leads to photon assisted cotunneling which in some cases may dominate the transport. We derive a general non-perturbative expression for the tunneling current in the presence of oscillating potentials and give a perturbative expression for the photon assisted cotunneling current.
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