Wigner-function formalism applied to semiconductor quantum devices: Need for nonlocal scattering models

Article

关键词: RESONANT-TUNNELING DIODES;    TRANSIENT-RESPONSE;    WAVE-PACKETS;    TRANSPORT;    SIMULATION;    FORMULATION;    EQUATION;    SYSTEMS;    DYNAMICS;    KINETICS;   

DOI  :  10.1103/PhysRevB.96.115420

来源: SCIE

【 摘 要 】

In designing and optimizing new-generation nanomaterials and related quantum devices, dissipation versus decoherence phenomena are often accounted for via local scattering models, such as relaxation-time and Boltzmann-like schemes. Here we show that the use of such local scattering approaches within the Wigner-function formalism may lead to unphysical results, namely anomalous suppression of intersubband relaxation, incorrect thermalization dynamics, and violation of probability-density positivity. Furthermore, we propose a quantum-mechanical generalization of relaxation-time and Boltzmann-like models, resulting in nonlocal scattering superoperators that enable one to overcome such limitations.

【 授权许可】

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