Effects of interface-roughness scattering on nonlinear electron transport in a superlattice based on exact solution of generalized Boltzmann transport equation

Po Hsin Shih, Danhong Huang, Godfrey Gumbs, Thi Nga Do, Christian P. Morath, T. Diana Maestas

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, an effective scattering-potential approach is proposed for treating interface-roughness scattering of drifting electrons within a superlattice. By utilizing established effective scattering potentials, a quasi-one-dimensional generalized Boltzmann transport equation is developed after a self-consistent internal scattering force is included. This generalized Boltzmann transport equation is solved exactly afterwords beyond the relaxation-time approximation. Furthermore, the dependence of the resulting steady-state current on interface-roughness parameters is analyzed at various temperatures and dc electric-field strengths by utilizing the calculated nonequilibrium electron occupation function. Meanwhile, the microscopic mechanism behind non-ohmic transport behavior is revealed by analyzing numerically the computed nonequilibrium electron occupation function and its dependence on interface roughness parameters as well as the dc electric field strength.

Original languageEnglish
Article number165304
JournalPhysical Review B
Volume108
Issue number16
DOIs
Publication statusPublished - 2023 Oct 15

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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