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Abstract: We investigate theoretically the transport properties of a mesoscopic systemdriven by a sequence of rectangular pulses applied at the contact to the inputleft lead. The characteristics of the current which would be measured in theoutput right lead are discussed in relation with the spectral properties ofthe sample. The time-dependent currents are calculated via a generalizednon-Markovian master equation scheme. We study the transient response of aquantum dot and of a narrow quantum wire. We show that the output responsedepends not only on the lead-sample coupling and on the length of the pulse butalso on the states that propagate the input signal. We find that by increasingthe bias window the new states available for transport induce additionalstructure in the relaxation current due to different dynamical tunnelingprocesses. The delay of the output signal with respect to the input current inthe case of the narrow quantum wire is associated to the transient time throughthe wire.



Autor: Valeriu Moldoveanu, Andrei Manolescu, Vidar Gudmundsson

Fuente: https://arxiv.org/



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