Special Section: Selected Papers from the 4th Mediterranean Conference on Nanophotonics

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

[+] Author Affiliations
Radmila Kostić

University of Belgrade, Institute of Physics, P.O. Box 68, 11080 Belgrade, Serbia

Dušanka Stojanović

University of Belgrade, Institute of Physics, P.O. Box 68, 11080 Belgrade, Serbia

J. Nanophoton. 6(1), 061606 (Sep 25, 2012). doi:10.1117/1.JNP.6.061606
History: Received April 12, 2012; Revised August 22, 2012; Accepted August 23, 2012
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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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© 2012 Society of Photo-Optical Instrumentation Engineers

Citation

Radmila Kostić and Dušanka Stojanović
"Electric field effect on the nonlinear and linear intersubband absorption spectra in CdTe/ZnTe spherical quantum dot", J. Nanophoton. 6(1), 061606 (Sep 25, 2012). ; http://dx.doi.org/10.1117/1.JNP.6.061606


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