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Composition and lattice mismatch dependent dielectric constants and optical phonon modes of InAs1−x−ySbxPy quaternary alloys

Infrared Physics & Technology
DOI: 10.1016/j.infrared.2014.08.006
  • Dielectric Properties
  • Lattice Dynamics
  • Lattice Matched
  • Lattice Mismatching
  • Quaternaries


Abstract Based on the pseudopotential formalism under the virtual crystal approximation, the dielectric and lattice vibration properties of zinc-blende InAs1−x−ySbxPy quaternary system under conditions of lattice matching and lattice mismatching to InAs substrates have been investigated. Generally, a good agreement is noticed between our results and the available experimental and theoretical data reported in the literature. The variation of all features of interest versus either the composition parameter x or the lattice mismatch percentage is found to be monotonic and almost linear. The present study provides more opportunities to get diverse high-frequency and static dielectric constants, longitudinal and transversal optical phonon modes and phonon frequency splitting by a proper choice of the composition parameters x and y (0⩽x⩽0.30, 0⩽y⩽0.69) and/or the lattice mismatch percentage.

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