A Theoretic Approach to SU（4） Kondo Effect in Carbon Nanotube Quantum Dots  

作　　者：朱瑞 

机构地区：[1]Department of Physics, Tsinghua University, Beijing 100084

出　　处：《Chinese Physics Letters》2006年第6期1578-1580,共3页中国物理快报（英文版）

摘　　要：We propose a mean field approach to the transport properties of carbon nanotube quantum dots. Quantum interaction between spin and orbital pseudo-spin degrees of freedom results in an SU（4） Kondo effect at low temperatures. By calculating the chemical potentials and the tunnelling strengths, and hence the spectral functions for different coupling constants and applied magnetic fields, we find that this exotic Kondo effect manifests as a four-peak splitting in the non-linear conductance when an axial magnetic field is applied.We propose a mean field approach to the transport properties of carbon nanotube quantum dots. Quantum interaction between spin and orbital pseudo-spin degrees of freedom results in an SU（4） Kondo effect at low temperatures. By calculating the chemical potentials and the tunnelling strengths, and hence the spectral functions for different coupling constants and applied magnetic fields, we find that this exotic Kondo effect manifests as a four-peak splitting in the non-linear conductance when an axial magnetic field is applied.

关 键 词：ELECTRON TRANSPORT CHARGE SYSTEM STATES 

分 类 号：O413[理学—理论物理]