| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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The nonlinear optical properties of a magneto-exciton in a strained Ga0.2In0.8As/GaAs quantum dot |
| N. R. Senthil Kumara, A. John Peterb, Chang Kyoo Yooc |
a Department of Physics, SBM College of Engineering and Technology, Dindigul-624 005, India;
b Department of Physics, Govt. Arts College, Melur-625 106, Madurai, India;
c Center for Environmental Studies/Green Energy Center, Deptartment of Environmental Science and Engineering, College of Engineering, Kyung Hee University, Seocheon-dong 1, Giheung-gu, Yongin-Si, Gyeonggi-Do, 446-701, South Korea |
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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.
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Received: 03 March 2013
Revised: 03 April 2013
Accepted manuscript online:
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PACS:
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71.70.Di
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(Landau levels)
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72.20.Ht
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(High-field and nonlinear effects)
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73.20.Hb
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(Impurity and defect levels; energy states of adsorbed species)
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73.21.La
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(Quantum dots)
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Corresponding Authors:
A. John Peter
E-mail: a.john.peter@gmail.com
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Cite this article:
N. R. Senthil Kumar, A. John Peter, Chang Kyoo Yoo The nonlinear optical properties of a magneto-exciton in a strained Ga0.2In0.8As/GaAs quantum dot 2013 Chin. Phys. B 22 107106
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