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arXiv 2202.12877cond-mat.mes-hallquant-ph
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石墨烯量子点中质量反转的电子散射

Electron scattering of mass-inverted in graphene quantum dots

Fatima Belokda, Ahmed Jellal, El Houssine Atmani

摘要:

研究了静电势作用下质量反转的圆形石墨烯量子点的狄拉克电子散射。得到的解决方案的能量谱被用来确定在两个区域的界面处的散射系数。使用大参数的渐近解,我们明确地确定了反射电流密度和散射效率的径向分量。研究发现,除了量子点内部的质量项外,外部质量项的存在强烈地影响电子的散射。特别是,非零平方模的散射系数被发现在零能量。

英文摘要:

We study the scattering of Dirac electrons of circular graphene quantum dot with mass-inverted subject to electrostatic potential. The obtained solutions of the energy spectrum are used to determine the scattering coefficients at the interface of the two regions. Using the asymptotic solutions at large arguments, we explicitly determine the radial component of reflected current density and the scattering efficiency. It is found that the presence of a mass term outside in addition to another one inside the quantum dot strongly affects the scattering of electrons. In particular, a non-null square modulus of the scattering coefficient is found at zero energy.

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