Floquet theory of electron waiting times in quantum-coherent conductors.
Phys Rev Lett
; 112(14): 146801, 2014 Apr 11.
Article
em En
| MEDLINE
| ID: mdl-24766000
ABSTRACT
We present a Floquet scattering theory of electron waiting time distributions in periodically driven quantum conductors. We employ a second-quantized formulation that allows us to relate the waiting time distribution to the Floquet scattering matrix of the system. As an application we evaluate the electron waiting times for a quantum point contact, modulating either the applied voltage (external driving) or the transmission probability (internal driving) periodically in time. Lorentzian-shaped voltage pulses are of particular interest as they lead to the emission of clean single-particle excitations as recently demonstrated experimentally. The distributions of waiting times provide us with a detailed characterization of the dynamical properties of the quantum-coherent conductor in addition to what can be obtained from the shot noise or the full counting statistics.
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MEDLINE
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En
Ano de publicação:
2014
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Article