Quantum dot dephasing by edge states
Y.Levinson
TL;DR
This paper investigates how Coulomb interactions with edge states in a nearby nanostructure cause dephasing of electron states in a quantum dot, affecting quantum coherence and transmission.
Contribution
It provides a calculation of the dephasing rate due to nonequilibrium density fluctuations in a ballistic nanostructure affecting a quantum dot.
Findings
Dephasing rate is linked to electron density fluctuations in the nanostructure.
Coherent transmission through the quantum dot is suppressed by dephasing.
Nonequilibrium fluctuations are the primary cause of dephasing in this setup.
Abstract
We calculate the dephasing rate of an electron state in a pinched quantum dot, due to Coulomb interactions between the electron in the dot and electrons in a nearby voltage biased ballistic nanostructure. The dephasing is caused by nonequilibrium time fluctuations of the electron density in the nanostructure, which create random electric fields in the dot. As a result, the electron level in the dot fluctuates in time, and the coherent part of the resonant transmission through the dot is suppressed.
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