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Dirac model of an isolated graphene antidot in a magnetic field

机译:磁场中孤立石墨烯解毒剂的狄拉克模型

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We consider a single graphene antidot, modeled via a circularly symmetric mass term in the Dirac Hamiltonian, in the presence of an external magnetic field. We derive analytical expressions for the eigenstate spinors, and use these to formulate an eigenvalue condition for the system. We find that electron-hole symmetry is broken in the individual valleys, while the combined spectrum of both valleys retains this symmetry. In the limit of an infinite mass term, we arrive at approximate analytical expressions for the energies. We discuss the dependence of the energy spectrum and the eigenstate spinors on the mass term and the magnetic field, as well as on the angular momentum of the eigenstate. We show that the density of states exhibits a very rich structure if the antidot radius is of the order of the magnetic length. By simulating scanning tunneling microscopy measurements, we discuss the possibility of experimentally probing states localized around the antidot.
机译:我们考虑存在外部磁场的情况下,通过狄拉克·汉密尔顿方程中的圆对称质量项对单个石墨烯解毒剂进行建模。我们导出本征态旋转子的解析表达式,并使用这些表达式来表达系统的本征值条件。我们发现电子-空穴对称性在各个谷中都被破坏了,而两个谷的组合光谱则保持了这种对称性。在无限质量项的极限中,我们得出了能量的近似解析表达式。我们讨论了能谱和本征态旋量对质量项和磁场以及本征态角动量的依赖性。我们表明,如果解毒点半径为磁长的量级,则态密度显示出非常丰富的结构。通过模拟扫描隧道显微镜测量,我们讨论了通过实验探测解毒剂周围局部状态的可能性。

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