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首页> 外文期刊>Physica, B. Condensed Matter >Differential conductance of a saddle-point constriction with a time-modulated gate-voltage
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Differential conductance of a saddle-point constriction with a time-modulated gate-voltage

机译：带有时间调制栅极电压的鞍点收缩的差分电导

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This work investigates how a time-modulated gate-voltage influences the differential conductance G of a saddle-point constriction. The constriction is modeled by a symmetric saddle-point potential and the time-modulated gate-voltage is represented by a potential of the form V(0)Theta(a/2 - x - x(c)) cos(omega t). For h omega less than half of the transverse subband energy level spacing, gate-voltage-assisted (suppressed) feature occurs when the chemical potential mu is less (greater) than but close to the threshold energy of a subband. Our results indicate that as mu increases, G exhibits, alternatively, the assisted and the suppressed feature. For a larger h omega, these two features may overlap. In addition, dip structures are found in the suppressed regime, and mini-steps are found in the assisted regime only when the gate-voltage covers a region sufficiently distant from the center of the constriction. (C) 1998 Elsevier Science B.V. All rights reserved. [References: 24]
机译：这项工作研究时间调制的栅极电压如何影响鞍点缩颈的差分电导G。收缩由对称的鞍点电势建模，时间调制的栅极电压由V（0）Theta（a / 2- x-x（c））cos（omega t ）。对于小于横向子带能级间隔一半的ω，当化学势mu小于（大于）但接近子带的阈值能量时，就会出现栅极电压辅助（抑制）特征。我们的结果表明，随着mu的增加，G呈现出辅助和抑制的特征。对于更大的ω，这两个特征可能会重叠。另外，仅当栅极电压覆盖距离缩颈中心足够远的区域时，才在抑制状态下发现倾角结构，而在辅助状态下发现小台阶。 （C）1998 Elsevier Science B.V.保留所有权利。 [参考：24]

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