Spin configuration transformation in laterally coupled few-electron artificial molecules |
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| Authors: | Zhenhong Dai Jinzuo Sun Lide Zhang Maowang Lu Zuohong Li Shiyong Huang |
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| Institution: | (1) Institute of Solid State Physics, Chinese Academy of Science, PO Box 1129, Hefei, 230031, PR China, CN;(2) CCAST(World Laboratory), PO Box 8730, Beijing 100080, PR China Institute of Opto-Electronic Information Technology, YanTai University, 264005, PR China, CN |
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| Abstract: | Artificial molecules, namely laterally coupled quantum dots with a three-dimensional spherical confinement potential well
of radius R and depth V
0, were studied by the unrestricted Hartree-Fock-Roothaan (UHFR) method. By varying the distance d between the centers of the two coupled quantum dots, the transition from the strong coupling situation to the weak one is
realized. Hund's rule, suitable for a single quantum dot is destroyed in certain conditions in the artificial molecule. For
example, in the few-electron system of the strongly coupled quantum-dot molecule, a transformation of spin configuration has
been found.
Received 8 March 2002 / Received in final form 29 May 2002 Published online 17 September 2002 |
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| Keywords: | PACS 73 23 Hk Coulomb blockade single-electron tunneling – 73 40 Gk Tunneling – 73 50 -h Electronic transport phenomena in thin films |
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