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

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作者
Shih, Po-Hsin [1 ]
Huang, Danhong [2 ]
Gumbs, Godfrey [1 ,3 ]
Do, Thi-Nga [4 ]
Morath, Christian P. [2 ]
Maestas, T. Diana [2 ]
机构
[1] CUNY, Dept Phys & Astron, Hunter Coll, 695 Pk Ave, New York, NY 10065 USA
[2] Air Force Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA
[3] Donostia Int Phys Ctr DIPC, P de Manuel Lardizabal 4, San Sebastian 20018, Basque Country, Spain
[4] Natl Cheng Kung Univ, Dept Phys, Tainan 701, Taiwan
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T [工业技术];
学科分类号
08 ;
摘要
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.
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页数:15
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