Discontinuous conductance of bichromatically ac-gated quantum wires

Details Discontinuous conductance of bichromatically ac-gated quantum wires Discontinuous conductance of bichromatically ac-gated quantum wires

2009-01-16

arxiv.org/abs/0901.2452v1

Phys. Rev. B 79, 155315 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 4 figures

Scientific paper

10.1103/PhysRevB.79.155315

We study the electron transport through a quantum wire under the influence of external time-dependent gate voltages. The wire is modelled by a tight-binding Hamiltonian for which we obtain the current from the corresponding transmission. The numerical evaluation of the dc current reveals that for bichromatic driving, the conductance depends sensitively on the commensurability of the driving frequencies. The current even possesses a discontinuous frequency dependence. Moreover, we find that the conductance as a function of the wire length oscillates with a period that depends on the ratio between the driving frequencies.

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