中国物理B ›› 2006, Vol. 15 ›› Issue (4): 828-832.doi: 10.1088/1009-1963/15/4/027

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Kondo effect for electron transport through an artificial quantum dot

孙科伟, 熊诗杰   

  1. Science School of Hangzhou Dianzi University, Hangzhou 310018, China; National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University,Nanjing 210093,China
  • 收稿日期:2005-07-24 修回日期:2006-01-24 出版日期:2006-04-20 发布日期:2006-04-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10074029 and 60276005),and by the State Key Development Program for Basic Research of China (Grant No G1999064509).

Kondo effect for electron transport through an artificial quantum dot

Sun Ke-Wei (孙科伟), Xiong Shi-Jie (熊诗杰)   

  1. Science School of Hangzhou Dianzi University, Hangzhou 310018, China; National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University,Nanjing 210093,China
  • Received:2005-07-24 Revised:2006-01-24 Online:2006-04-20 Published:2006-04-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10074029 and 60276005),and by the State Key Development Program for Basic Research of China (Grant No G1999064509).

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摘要： We have calculated the transport properties of electron through an artificial quantum dot by using the numerical renormalization group technique in this paper. We obtain the conductance for the system of a quantum dot which is embedded in a one-dimensional chain in zero and finite temperature cases. The external magnetic field gives rise to a negative magnetoconductance in the zero temperature case. It increases as the external magnetic field increases. We obtain the relation between the coupling coefficient and conductance. If the interaction is big enough to prevent conduction electrons from tunnelling through the dot, the dispersion effect is dominant in this case. In the Kondo temperature regime, we obtain the conductivity of a quantum dot system with Kondo correlation.

Abstract: We have calculated the transport properties of electron through an artificial quantum dot by using the numerical renormalization group technique in this paper. We obtain the conductance for the system of a quantum dot which is embedded in a one-dimensional chain in zero and finite temperature cases. The external magnetic field gives rise to a negative magnetoconductance in the zero temperature case. It increases as the external magnetic field increases. We obtain the relation between the coupling coefficient and conductance. If the interaction is big enough to prevent conduction electrons from tunnelling through the dot, the dispersion effect is dominant in this case. In the Kondo temperature regime, we obtain the conductivity of a quantum dot system with Kondo correlation.

Key words: Kondo effect, quantum dot, numerical renormalization group

中图分类号:  (Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect))

  • 72.10.Fk
73.63.Kv (Quantum dots) 75.20.Hr (Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions)