Effects of Conduction Electron Band Structure on Transport of Quantum Dot Systems
YANG Kai-Hua1, SONG Bo3,4,5, TIAN Guang-Shan2, WANG Yu-Peng4, HAN Ru-Shan2, HAN Ru-Qi1
1Institute for Microelectronics, Peking University, Beijing 100871
2School of Physics, Peking University, Beijing 100871
3Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080
4Institute of Physics and Center for Condensed Matter Physics,Chinese Academy of Sciences, Beijing 100080
5Graduate School, Chinese Academy of Sciences, Beijing 100039
Effects of Conduction Electron Band Structure on Transport of Quantum Dot Systems
YANG Kai-Hua1;SONG Bo3,4,5;TIAN Guang-Shan2;WANG Yu-Peng4;HAN Ru-Shan2;HAN Ru-Qi1
1Institute for Microelectronics, Peking University, Beijing 100871
2School of Physics, Peking University, Beijing 100871
3Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080
4Institute of Physics and Center for Condensed Matter Physics,Chinese Academy of Sciences, Beijing 100080
5Graduate School, Chinese Academy of Sciences, Beijing 100039
Abstract： We study the effects of the energy band structure of conduction-electron on the transport properties of an interacting quantum dot system. By applying the nonequilibrium Keldysh Green function technique, we show that the finite width of electron band in leads causes the negative differential conductance in some regions of the applied voltage. We also show that the van Hove singularities in the density of states of conduction-electron do not qualitatively change the differential conductance of the system, and hence can be safely ignored. Therefore, the wide band approximation used in the previous investigations is partially justified.
YANG Kai-Hua;SONG Bo;;TIAN Guang-Shan;WANG Yu-Peng;HAN Ru-Shan;HAN Ru-Qi. Effects of Conduction Electron Band Structure on Transport of Quantum Dot Systems[J]. 中国物理快报, 2003, 20(5): 717-720.
YANG Kai-Hua, SONG Bo, , TIAN Guang-Shan, WANG Yu-Peng, HAN Ru-Shan, HAN Ru-Qi. Effects of Conduction Electron Band Structure on Transport of Quantum Dot Systems. Chin. Phys. Lett., 2003, 20(5): 717-720.
2003, Vol. 20 
