DIRECT CALCULATION OF TUNNELING CURRENT
DIRECT CALCULATION OF TUNNELING CURRENT
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DOI：
10.1088/0022-3719/4/8/018
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发表时间：
1971-01-01
期刊：
影响因子：
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通讯作者：
SAINTJAM.D
中科院分区：
文献类型：
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作者：
CAROLI, C;COMBESCO.R;SAINTJAM.D
本文提出了一个简单的金属-绝缘体-金属隧穿结模型哈密顿量，它允许直接计算隧穿电流而不引入任何有效的哈密顿量。该模型依赖于本地化功能的使用，这个过程避免了困难的匹配问题的障碍和电极之间的边界。此外，使用Kjeldysh的微扰理论的非平衡系统允许一个明确的计算电流的所有订单中所施加的偏压。发现电流表达式中出现的传递系数与能量有关。该模型可以系统地扩展到包括许多身体效应。
A simple model Hamiltonian is proposed for a metal-insulator-metal tunneling junction, which permits the direct calculation of the tunneling current without introducing any effective Hamiltonian. The model rests on the use of localized functions; this procedure avoids the difficult matching problem at the boundary between the barrier and the electrodes. Moreover the use of Kjeldysh's perturbation theory for nonequilibrium system allows an explicit calculation of the current to all orders in the applied bias. It is found that the transfer coefficient appearing in the expression for the current is energy dependent. This model can be systematically extended to include many body effects.