Application of the tight‐binding Green’s function method to interface roughness in resonant tunneling heterostructures

Autor:	Toshiaki Ikoma, Jeffrey Frey, Lindor E. Henrickson, Kazuhiko Hirakawa
Rok vydání:	1992
Předmět:	symbols.namesake Tunnel effect Tight binding Effective mass (solid-state physics) Hamiltonian matrix Condensed matter physics Chemistry Green's function symbols General Physics and Astronomy Matter wave Hamiltonian (quantum mechanics) Quantum tunnelling
Zdroj:	Journal of Applied Physics. 71:3883-3888
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.350854
Popis:	Tight‐binding Hamiltonian matrix elements are derived including the effects of a space‐dependent effective mass. The matrix elements are formulated for a single‐particle effective‐mass Hamiltonian in the nearest‐neighbor approximation. The resulting Hamiltonian matrix has been used to investigate the effect of heterointerface roughness in double barrier resonant tunneling structures. Calculations show that a resonant level splitting in the transmission characteristic can occur when the lateral scale of the heterointerface roughness becomes longer than the de Broglie wavelength of the resonant energy. The observed level splitting is explained in terms of an averaging of transmission through parallel resonant structures having different well widths.
Databáze:	OpenAIRE
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