Decoherence and dephasing in molecular electronic devices

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Title: Decoherence and dephasing in molecular electronic devices
Author: Walczak, Kamil; Lyshevski, Sergey
Abstract: This paper presents theoretical studies of the effect of decoherence on nonlinear electron transport that affect the current-voltage (I-V) characteristics as well as the power dissipated in the molecular electronic devices. The calculations are performed using the non-equilibrium Green functions (NEGF) formalism applying the Hückel concept to linear atomic chains weakly connected to terminals (electrodes). Those interconnected molecules are examined by making use of the wide-band approximation. The charging effects are modeled using the self-consistent potential, while the dephasing effect is examined by the use of complex potential. It is shown that for higher voltages the molecular junction may be unstable due to incoherent conduction process, while the magnitude of the current flowing through the junction decreases exponentially with increasing the values of dephasing potential.
Description: Copyright 2006 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
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Date: 2006-06

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