Nonlinear Optical Rectification of Confined Exciton in a ZnO/ZnMgO Strained Quantum Dot

Authors N.S. Minimala1, A. John Peter2

Department of Physics, N.M.S. Sermathai Vasan College for Women, 625 012 Madurai, India

Department of Physics, Government Arts College, Melur, 625 106 Madurai, India

Issue Volume 4, Year 2012, Number 4
Dates Received 16 October 2012; revised manuscript received 22 October 2012; published online 29 December 2012
Citation N.S. Minimala, A. John Peter, J. Nano- Electron. Phys. 4 No 4, 04004 (2012)
PACS Number(s) 73.21.Fg, 42.65.An, 71.38. – k
Keywords Electronic states (2) , Optical absorption (3) , Quantum dot (12) .
Heavy hole exciton binding energies as functions of dot radius and the Mg alloy content in a ZnO/MgxZn1 – xO quantum dot are investigated. The effects of strain, including the hydrostatic and the biaxial strain, and the internal electric field, due to spontaneous and piezoelectric polarization are taken into account. Numerical calculations are performed using variational procedure within the single band effective mass approximation. The nonlinear optical rectification is investigated for different dot radius and the values of Mg alloy content in a ZnO/MgxZn1 – xO quantum dot taking into account the strain-induced piezoelectric effects. The results show that the resonant peak of the nonlinear optical rectification is blue shifted with the confinement effect and the Mg alloy content.

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