Scattering nonlocality in quantum charge transport: Application to semiconductor nanostructures

Article

关键词: WIGNER-FUNCTION FORMALISM;    ELECTRON-TRANSPORT;    PHOTOEXCITED SEMICONDUCTORS;    BLOCH EQUATIONS;    CASCADE LASERS;    DEVICES;    SYSTEMS;    FORMULATION;    COHERENCE;    KINETICS;   

DOI  :  10.1103/PhysRevB.89.205415

来源: SCIE

【 摘 要 】

Our primary goal is to provide a rigorous treatment of scattering nonlocality in semiconductor nanostructures. On the one hand, starting from the conventional density-matrix formulation and employing as ideal instrument for the study of the semiclassical limit the well-known Wigner-function picture, we shall perform a fully quantum-mechanical derivation of the space-dependent Boltzmann equation. On the other hand, we shall examine the validity limits of such semiclassical framework, pointing out, in particular, regimes where scattering-nonlocality effects may play a relevant role; to this end we shall supplement our analytical investigation with a number of simulated experiments, discussing and further expanding preliminary studies of scattering-induced quantum diffusion in GaN-based nanomaterials. As for the case of carrier-carrier relaxation in photoexcited semiconductors, our analysis will show the failure of simplified dephasing models in describing phonon-induced scattering nonlocality, pointing out that such limitation is particularly severe for the case of quasielastic dissipation processes.

【 授权许可】

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