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arXiv 2103.16600cond-mat.mes-hallquant-ph
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石墨烯磁势垒中隧穿时间的间隙可调

Gap-tunable of Tunneling Time in Graphene Magnetic Barrier

Youssef Fattasse, Miloud Mekkaoui, Ahmed Jellal, Abdelhadi Bahaoui

摘要:

通过引入静电势和质量项,研究了Dirac费米子在石墨烯磁垒中的隧穿时间。后者在光谱中产生能隙,因此影响系统的隧穿特性。为了澄清,我们首先从推导狄拉克方程的本征旋量解开始,然后将它们与入射,反射和透射光束波联系起来。这种连接使我们能够获得相应的相移,从而计算传输和反射中的群延迟时间。数值计算结果表明,在隧穿单个势垒的过程中,群延迟时间强烈地依赖于能隙。此外,我们还发现,在能隙的某一临界值处,群趋于统一,并且变得与所涉及的物理参数的强度无关。

英文摘要:

We study the tunneling time of Dirac fermions in graphene magnetic barrier through an electrostatic potential and a mass term. This latter generates an energy gap in the spectrum and therefore affects the proprieties of tunneling of the system. For clarification, we first start by deriving the eigenspinors solutions of Dirac equation and second connect them to the incident, reflected and transmitted beam waves. This connection allows us to obtain the corresponding phases shifts and consequently compute the group delay time in transmission and reflection. Our numerical results show that the group delay time depends strongly on the energy gap in the tunneling process through single barrier. Moreover, we find that the group approaches unity at some critical value of the energy gap and becomes independent to the strengths of involved physical parameters.

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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