Vibrational effects on low-temperature properties of molecular conductors
- 作者：Jernej Mravlje ; Anton Ramš ; ak ; Rok Ž ; itko
- 关键词：Kondo effect ; Molecular conductors ; Dynamic symmetry breaking
- 刊名：Physica B
- 出版年：2008
- 期刊代码：53_09214526
- 类别：ph
- 出版时间：1 April 2008
- 卷：403
- 期：5-9
- 页码：1484-1486
- 文件大小：132 K
摘要
We calculate characteristic correlation functions for the Anderson model with additional phonon-assisted coupling to the odd conduction channel. This model describes, for example, the behavior of a molecule embedded between two electrodes in linear transport experiments where the position of the molecule with respect to the leads affects the tunneling amplitudes. We use variational projection-operator method and numerical renormalization group (NRG) method. The spin is Kondo screened either by even or odd conduction channel depending on the gate voltage and electron-phonon coupling. However, in all regimes the gate-voltage dependence of the zero temperature conductance is found to be qualitatively the same as in the model with no coupling to the vibrational mode.