1. The nonlinear optical properties of a magneto-exciton in a strained Ga0.2In0.8As/GaAs quantum dot.
- Author
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Kumar, N. R. Senthil, Peter, A. John, and Yoo, Chang Kyoo
- Subjects
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OSCILLATOR strengths , *EXCITON theory , *QUANTUM dots , *MAGNETIC fields , *ABSORPTION spectra - Abstract
The magnetic field-dependent heavy hole excitonic states in a strained Ga0.2In0.8As/GaAs quantum dot are investigated by taking into account the anisotropy, non-parabolicity of the conduction band, and the geometrical confinement. The strained quantum dot is considered as a parabolic dot of InAs embedded in a GaAs barrier material. The dependence of the effective excitonic g-factor as a function of dot radius and the magnetic field strength is numerically measured. The interband optical transition energy as a function of geometrical confinement is computed in the presence of a magnetic field. The magnetic field-dependent oscillator strength of interband transition under the geometrical confinement is studied. The exchange enhancements as a function of dot radius are observed for various magnetic field strengths in a strained Ga0.2In0.8As/GaAs quantum dot. Heavy hole excitonic absorption spectra, the changes in refractive index, and the third-order susceptibility of third-order harmonic generation are investigated in the Ga0.2In0.8As/GaAs quantum dot. The result shows that the effect of magnetic field strength is more strongly dependent on the nonlinear optical property in a low-dimensional semiconductor system. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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