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arXiv 1001.1608cond-mat.mes-hall
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半导体-金属结非线性输运的解析研究

Analytical study of non-linear transport across a semiconductor-metal junction

N. M. R. Peres

摘要:

在本文中,我们研究了解析一维模型的半导体-金属结。我们研究了半无限半导体和金属耦合在一起时Tamm态的形成以及它们是如何演化的。用非平衡格林函数方法研究了非线性电流与偏压的关系,给出了界面的密度矩阵。定义接口的网站的电子占领具有很强的非线性作为偏置电压的函数,由于强共振存在于格林函数的结网站。表面格林函数是通过求解二次矩阵方程来解析计算的,这不需要在能量上增加一个小的虚常数。给出了表面态的波函数。

英文摘要:

In this paper we study analytically a one-dimensional model for a semiconductor-metal junction. We study the formation of Tamm states and how they evolve when the semi-infinite semiconductor and metal are coupled together. The non-linear current, as a function of the bias voltage, is studied using the non-equilibrium Green's function method and the density matrix of the interface is given. The electronic occupation of the sites defining the interface has strong non-linearities as function of the bias voltage due to strong resonances present in the Green's functions of the junction sites. The surface Green's function is computed analytically by solving a quadratic matrix equation, which does not require adding a small imaginary constant to the energy. The wave function for the surface states is given.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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