Tunneling Effect of Fermions in Silicene Through Potential Barrier

IF 2.2 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
Sanae Zriouel, Ahmed Jellal
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引用次数: 0

Abstract

The influence of a a rectangular potential barrier on the quantum transport of fermions in silicene is explored. Specifically, analytical solutions are presented to derive transmission and reflection probabilities together with conductance. It is shown that the transmission is highly sensitive to both the barrier height and incident energy. As a result, the occurrence of Klein and resonant tunnelings is observed, with a significant dependence on the barrier width. Notably, it is found that perfect transmission extends beyond normal incidence, occurring at various oblique angles. Moreover, the transmission pattern exhibits a more fragmented structure with increasing barrier width, reminiscent of Fabry-Pérot resonances. In contrast, the conductance displays a non-monotonic dependence on incident energy and features rapid oscillations with a rising barrier height. However, at a constant barrier height, there is a minimal disparity among conductance profiles for high incident energy values. When incident energy equals the barrier height, the conductance experiences a local minimum. For a thin barrier, a substantial reduction in conductance is observed, unlike the oscillatory behavior seen with a thicker barrier. These findings underscore the progress in silicene research and offer a fresh perspective on the relativistic applications of tunneling in this material.

Abstract Image

硅烯中费米子通过势垒的隧道效应
本文探讨了矩形势垒对硅烯中费米子量子传输的影响。具体来说,本文提出了分析解决方案,以推导出透射和反射概率以及电导。结果表明,传输对势垒高度和入射能量都非常敏感。因此,可以观察到克莱因隧道和共振隧道的发生,并与势垒宽度有很大关系。值得注意的是,研究发现完美的透射超出了正常入射角,在各种斜角下都会出现。此外,随着势垒宽度的增加,透射图案呈现出更加分散的结构,让人联想到法布里-佩罗共振。与此相反,电导与入射能量呈非单调依赖关系,并随着势垒高度的增加而快速振荡。然而,在势垒高度不变的情况下,高入射能量值的电导曲线之间的差异很小。当入射能量等于势垒高度时,电导出现局部最小值。对于较薄的阻挡层,可以观察到电导的大幅降低,这与较厚阻挡层的振荡行为不同。这些发现强调了硅烯研究的进展,并为这种材料中隧道的相对论应用提供了全新的视角。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Annalen der Physik
Annalen der Physik 物理-物理:综合
CiteScore
4.50
自引率
8.30%
发文量
202
审稿时长
3 months
期刊介绍: Annalen der Physik (AdP) is one of the world''s most renowned physics journals with an over 225 years'' tradition of excellence. Based on the fame of seminal papers by Einstein, Planck and many others, the journal is now tuned towards today''s most exciting findings including the annual Nobel Lectures. AdP comprises all areas of physics, with particular emphasis on important, significant and highly relevant results. Topics range from fundamental research to forefront applications including dynamic and interdisciplinary fields. The journal covers theory, simulation and experiment, e.g., but not exclusively, in condensed matter, quantum physics, photonics, materials physics, high energy, gravitation and astrophysics. It welcomes Rapid Research Letters, Original Papers, Review and Feature Articles.
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