Department of Quantum Electronics, Graduate School of Engineering, Osaka University, Suita, Osaka, Japan.
J Phys Condens Matter. 2011 Nov 2;23(43):435301. doi: 10.1088/0953-8984/23/43/435301. Epub 2011 Oct 13.
We theoretically investigate electron transport in a one-dimensional conductor with a locally disordered potential by using the non-equilibrium Green's function theory. It is found that, by changing the energy of a site in a one-dimensional atomic chain, the electron conductivity can be larger when the modulated site energy is smaller than that of the other sites. This contradicts the conventional picture that an electron is scattered by the disorder of the potential, because such a scattering process usually causes resistivity. We show that the enhancement of conductivity that seems contradictory to the conventional picture of electron motion is explained by the change of energy of quasi bound states in the conductor.
我们通过使用非平衡格林函数理论理论上研究了具有局域无序势的一维导体中的电子输运。结果发现，通过改变一维原子链中一个位置的能量，当调制位置的能量小于其他位置的能量时，电子电导率可以更大。这与电子被势的无序散射的传统图像相矛盾，因为这种散射过程通常会导致电阻率。我们表明，通过改变导体中准束缚态的能量，可以解释这种似乎与电子运动的传统图像相矛盾的电导率增强。
