Study on the coupled multiple nanocrystal quantum-dot system |
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Authors: | ZhenHong Dai JinZuo Sun LiDe Zhang ZuoHong Li ShiYong Huang |
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Institution: | a Institute of Solid State Physics, Chinese Academy of Science, P.O. Box 1129, Hefei, 230031, China;b Institute of Opto-Electronic Information Technology, Yantai University, 264005, China;c CCAST (World Laboratory), P.O. Box 8730, Beijing 100080, China |
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Abstract: | We have studied excess electron filling rule in the coupled multiple nanocrystal quantum-dot systems, i.e. quantum chain and quantum pattern, by the unrestricted Hartree–Fock–Roothaan method. Assuming each quantum dot of quantum pattern to be confined in a three-dimensional spherical potential well of finite depth, we have studied the intradot and interdot electron Coulomb and exchange interactions. By varying the center distance d between the coupled quantum dots, the transition from the strong- to weak-coupling situation is realized. For the systems in question, our results show that, with the filling of excess electrons into the quantum pattern, the corresponding chemical potentials form quasi-band structure, which is similar to the energy-band structure of crystal material. In each chemical-potential band of quantum pattern, the number of chemical-potential curves is equal to the number of quantum dots, and the distributions of them depend strongly on the quantum-dot arrangement structure of quantum pattern. |
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Keywords: | Quantum dot Nanocrystal Quantum pattern |
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