Dephasing in a quantum pump

Article

关键词: TIME-DELAY MATRIX;    CHAOTIC CAVITY;    ELECTRON PUMP;    TRANSPORT;    SCATTERING;    CONDUCTORS;    BARRIERS;    DOT;   

DOI  :  10.1103/PhysRevB.65.115333

来源: SCIE

【 摘 要 】

We study how dephasing affects the distribution of the dc current pumped through a chaotic quantum dot. We introduce dephasing by the addition of a voltage probe to the quantum dot, treating both the case of controlled dephasing (when the voltage probe is coupled to the dot via a ballistic point contact with a conductance that is increased stepwise) and intrinsic dephasing (for which the voltage probe serves as a phenomelogical model). While dephasing eventually suppresses the dc current through the dot, we also find that, for a quantum dot with single-mode point contacts, a small amount of dephasing actually decreases the likelihood of a zero pumped current.

【 授权许可】

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