AC field induced quantum rectification effect in tunnel junctions

Details AC field induced quantum rectification effect in tunnel junctions AC field induced quantum rectification effect in tunnel junctions

2003-09-12

arxiv.org/abs/cond-mat/0309302v1

Physics

Condensed Matter

4 pages, 3 figures, to be published in Physical Review B

Scientific paper

10.1103/PhysRevB.68.153107

We study the appearance of directed current in tunnel junctions, quantum ratchet effect, in the presence of an external ac field f(t). The current is established in a one-dimensional discrete inhomogeneous "tight-binding model". By making use of a symmetry analysis we predict the right choice of f(t) and obtain the directed current as a difference between electron transmission coefficients in opposite directions, $\Delta T = T^{LR}-T^{RL}$. Numerical simulations confirm the predictions of the symmetry analysis and moreover, show that the directed current can be drastically increased by a proper choice of frequency and amplitudes of the ac field f(t).

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