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
孙科伟, 熊诗杰
Sun Ke-Wei (孙科伟), Xiong Shi-Jie (熊诗杰)
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.
中图分类号: (Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect))