Spin configuration transformation in laterally coupled few-electron artificial molecules

  • Zhenhong Dai
  • Jinzuo Sun
  • Lide Zhang
  • Maowang Lu
  • Zuohong Li
  • Shiyong Huang

Abstract:

Artificial molecules, namely laterally coupled quantum dots with a three-dimensional spherical confinement potential well of radius R and depth V0, 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.

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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Copyright information

© EDP Sciences, Springer-Verlag 2002

Authors and Affiliations

  • Zhenhong Dai
    • 1
  • Jinzuo Sun
    • 2
  • Lide Zhang
    • 1
  • Maowang Lu
    • 1
  • Zuohong Li
    • 2
  • Shiyong Huang
    • 2
  1. 1.Institute of Solid State Physics, Chinese Academy of Science, PO Box 1129, Hefei, 230031, PR ChinaCN
  2. 2.CCAST(World Laboratory), PO Box 8730, Beijing 100080, PR China Institute of Opto-Electronic Information Technology, YanTai University, 264005, PR ChinaCN

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