Kondo effect for electron transport through an artificial quantum dot |
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Authors: | Sun Ke-Wei and Xiong Shi-Jie |
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Affiliation: | Science School of Hangzhou Dianzi University, Hangzhou 310018, China; National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University,Nanjing 210093,China |
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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. |
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Keywords: | Kondo effect quantum dot numerical renormalization group |
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