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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 |
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| Cite this article: |
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YANG Kai-Hua, SONG Bo, TIAN Guang-Shan et al 2003 Chin. Phys. Lett. 20 717-720 |
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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.
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| Keywords:
72.15.Qm
73.20.At
73.23.Hk
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Published: 01 May 2003
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| PACS: |
72.15.Qm
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(Scattering mechanisms and Kondo effect)
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73.20.At
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(Surface states, band structure, electron density of states)
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73.23.Hk
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(Coulomb blockade; single-electron tunneling)
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