Electric field effect on the nonlinear and linear intersubband absorption spectra in CdTe/ZnTe spherical quantum dot

Radmila Kostic; Dusanka Stojanovic

doi:10.1117/1.JNP.6.061606

25 September 2012 Electric field effect on the nonlinear and linear intersubband absorption spectra in CdTe/ZnTe spherical quantum dot

Radmila Kostic, Dusanka Stojanovic

Author Affiliations +

Journal of Nanophotonics, Vol. 6, Issue 1, 061606 (September 2012). https://doi.org/10.1117/1.JNP.6.061606

Abstract

Linear and nonlinear absorption spectra of neutral D⁰ hydrogenic impurity located at the center of the CdTe/ZnTe spherical quantum dot (QD) were investigated after assuming a spherically symmetric confining potential of finite depth. Calculations were performed under the effective mass approximation on the basis of exact solution of the Schrödinger and Poisson equations. Eigenfunctions were expressed in terms of the Whittaker and Coulomb wave functions. Results for D⁰ impurity energies of ground 1s, and excited 2p, 3d, and 2s states strongly depend on QD radius if it does not exceed a few effective Bohr radius. Wave functions and Stark shift energy levels in external electric field were determined from a variational-calculus approach for states labeled m=0. The absorption spectra for intersubband transitions were found to depend strongly on the QD radius. Whether or not the impurity is present, the peak energy of absorption decreases with increasing QD radius. An external electric field increases the transition energy but does not significantly change absorption characteristics.

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Radmila Kostic and Dusanka Stojanovic "Electric field effect on the nonlinear and linear intersubband absorption spectra in CdTe/ZnTe spherical quantum dot," Journal of Nanophotonics 6(1), 061606 (25 September 2012). https://doi.org/10.1117/1.JNP.6.061606

Published: 25 September 2012

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