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Title: Energy dispersion contour approach to calculate optical properties of quantum well structures
Authors: Tanakorn Osotchan
Keywords: Fermi-Dirac;Energy;Hamiltonian;quantum well
Issue Date: 2000
Publisher: Optical Properties of Materials
Citation: Osotchan T, Wei S, Daohua Z. Energy dispersion contour approach to calculate optical properties of quantum well structures. Materials Research Society Symposium 2000;(579):207-212.
Abstract: In order to calculate optical properties i.e. dielectric function, refractive index and absorption coefficient, the evaluation of integration including ground and excited wavefunctions is required over entire k-space. The contour of energy dispersion was proposed to form the criteria to select and limit the value of k in the integration. With the contour approach the integration can be determined to truncate at certain k value where the weight factor of Fermi-Dirac distribution function become very small and the fraction of integration can be ignored. The approach was applied to AlGaAs/AlAs/GaAs double barrier quantum well structures with 14-band k.p Hamiltonian. By systematically modifing this quantum well structure the dependence of absorption peak width was investigated in bound-to-bound and bound-to-quasibound intersubband transitions. The energy dispersion contours of each involved state were illustrated in two dimensional k-space including the compositions in perpendicular and parallel directions to the interface. The calculated refractive index and absorption as a function of wavelength can be simply extracted from the contour characteristic especially at the constant Fermi energy surface.
ISSN: 02729172
Appears in Collections:Physics: International Proceedings

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