Exciton states and interband optical transitions in ZnO/MgZnO quantum dots |
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Authors: | SY Wei LL Wei CX Xia X Zhao Y Wang |
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Institution: | College of Physics and Information Engineering, Henan Normal University, Xinxiang 453007, China |
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Abstract: | Within the framework of the effective-mass approximation, the exciton states confined in wurtzite ZnO/MgZnO quantum dot (QD) are calculated using a variational procedure, including three-dimensional confinement of carriers in the QD and the strong built-in electric field effect due to the piezoelectricity and spontaneous polarizations. The exciton binding energy and the electron-hole recombination rate as functions of the height (or radius) of the QD are studied. Numerical results show that the strong built-in electric field leads to a remarkable electron-hole spatial separation, and this effect has a significant influence on the exciton states and optical properties of wurtzite ZnO/MgZnO QD. |
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Keywords: | 73 21 La 71 35 &minus y 77 65 Ly |
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