High-frequency blockade in tight-binding one-dimensional lattice with single vibrating siteM. V. Entin1 and M. M. Mahmoodian1, 2
1 Institute of Semiconductor Physics, Siberian Division, Russian Academy of Sciences - Novosibirsk, 630090 Russia
2 Novosibirsk State University - Novosibirsk, 630090, Russia
received 26 August 2008; accepted in final form 20 October 2008; published November 2008
published online 17 November 2008
A one-dimensional tight-binding lattice, the single site of which possesses a harmonically vibrating level is studied. The states of non-interacting electrons are considered both numerically and (in the case of narrow band) analytically. It is shown that at definite conditions the site reflects electrons incident from infinity absolutely and elastically. This phenomenon, called high-frequency blockade, is accompanied by the vanishing of the system static conductance when the Fermi level crosses the blockade states. Together with these states we have found local and reflectionless states. Possible realizations of the system as a lattice of quantum dots or a linear polymer are discussed.
73.50.Pz - Photoconduction and photovoltaic effects.
73.23.-b - Electronic transport in mesoscopic systems.
85.35.Be - Quantum well devices (quantum dots, quantum wires, etc.).
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