Coherent potential approximation for spatially correlated disorder

Article

关键词: SEMICONDUCTOR ALLOYS;    ANALYTIC APPROXIMATION;    QUANTUM STRUCTURES;    FRENKEL EXCITONS;    BINARY ALLOYS;    SPECTRA;    SYSTEMS;    ABSORPTION;   

DOI  :  10.1103/PhysRevB.80.144202

来源: SCIE

【 摘 要 】

The coherent-potential approximation (CPA) is extended to describe satisfactorily the motion of particles in a random potential which is spatially correlated and smoothly varying. In contrast to existing cluster-CPA methods, the present scheme preserves the simplicity of the conventional CPA but leads to a momentum and frequency-dependent self-energy. Its accuracy is checked by a comparison with the exact moments of the Green's function and with the spectral function from numerical simulations. The scheme is applied to excitonic absorption spectra in different spatial dimensions.

【 授权许可】

Free