Time-Dependent Transport through a Mesoscopic Structure

Details Time-Dependent Transport through a Mesoscopic Structure Time-Dependent Transport through a Mesoscopic Structure

1993-01-21

arxiv.org/abs/cond-mat/9301026v1

Physics

Condensed Matter

REVTEX, 12 pages + 2 postscript figures (also available as hard copies from wingreen@research.nj.nec.com) Nordita preprint 93/

Scientific paper

10.1103/PhysRevB.48.8487

We present a general formulation of the nonlinear, time-dependent current through a small interacting region, where electron energies are changed by time-dependent voltages. An exact solution is obtained for the non-interacting case when the elastic coupling to the leads is independent of energy. Temporal phase coherence in a double-barrier tunneling structure produces ``ringing" in the response of the current to a voltage pulse, which can be observed experimentally in the dc-current by varying the pulse length in a train of voltage pulses. The nonlinear current due to an ac-bias also shows complex time-dependence.

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