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Chinese Physics, 2006, Vol. 15(9): 2102-2107    DOI: 10.1088/1009-1963/15/9/033
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Effect of electric field on the electronic spectrum and the persistent current of a quantum ring with two electrons

Wu Hong(吴洪)b) and Bao Cheng-Guang(鲍诚光)a)
a Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Collisions, Lanzhou 730000, China; b Department of Physics, School of Science, Jimei University, Xiamen 361021, China
Abstract  The effect of an electric field E on a narrow quantum ring that contains two electrons and is threaded by a magnetic flux B has been investigated. Localization of the electronic distribution and suppression of the Aharonov--Bohm oscillation (ABO) are found in the two-electron ring, which are similar to those found in a one-electron ring. However, the period of ABO in a two-electron ring is reduced by half compared with that in a one-electron ring. Furthermore, during the variation of B, the persistent current of the ground state may undergo a sudden change in sign. This change is associated with a singlet--triplet transition and has no counterpart in one-electron rings. For a given E, there exists a threshold of energy. When the energy of the excited state exceeds the threshold, the localization would disappear and the ABO would recover. The value of the threshold is proportional to the magnitude of E. Once the threshold is exceeded, the persistent current is much stronger than the current of the ground state at E=0.
Keywords:  quantum ring      electronic structure      effect of electric field  
Received:  15 January 2006      Revised:  18 May 2006      Accepted manuscript online: 
PACS:  61.72.Lk (Linear defects: dislocations, disclinations)  
  61.72.Hh (Indirect evidence of dislocations and other defects (resistivity, slip, creep, strains, internal friction, EPR, NMR, etc.))  
  61.72.Bb (Theories and models of crystal defects)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No 10574163), the Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Collisions, Lanzhou, China.

Cite this article: 

Wu Hong(吴洪) and Bao Cheng-Guang(鲍诚光) Effect of electric field on the electronic spectrum and the persistent current of a quantum ring with two electrons 2006 Chinese Physics 15 2102

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