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Microscopic theory of scattering in imperfect strained antimonide-based heterostructures

Lookup NU author(s): Dr Michael Shaw


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A microscopic theory to provide quantitative predictions of scattering cross sections and carrier lifetimes in imperfect strained layer superlattices is developed. Strain-dependent empirical pseudopotentials are formulated to obtain the electronic wave functions with the results of scattering theory employed to extract the dynamical information. The theory is applied to a number of imperfect GaxIn1-xSb/InAs superlattices, containing isovalent substitutional anion defects, both isolated and in interface islands. Key factors governing the lifetime are identified, including defect atom type, location and lattice relaxation, and the detailed size and shape of the interface islands. Multiple scattering processes are shown to become significant for larger interface islands. Typical elastic scattering lifetimes for isolated antimony defects of 1.6 μs are predicted, dropping to 0.4 ns for islands containing approximately 50 defect ions. ©2000 The American Physical Society.

Publication metadata

Author(s): Shaw MJ

Publication type: Article

Publication status: Published

Journal: Physical Review B - Condensed Matter and Materials Physics

Year: 2000

Volume: 61

Issue: 8

Pages: 5431-5441

Print publication date: 01/01/2000

ISSN (print): 1098-0121

ISSN (electronic): 1550-235X

Publisher: American Physical Society


DOI: 10.1103/PhysRevB.61.5431


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