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arXiv 1102.3580cond-mat.mes-hallcond-mat.dis-nn
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磁场作用下双层石墨烯的电导:无序效应

Conductance of bilayer graphene in the presence of a magnetic field: Effects of disorder

H. Hatami, N. Abedpour, A. Qaiumzadeh, Reza Asgari

摘要:

研究了垂直磁场作用下双层石墨烯纳米管在n-p和n-n结中的电子输运性质。使用非平衡格林函数方法和Landauer-Büttiker形式主义,电导的情况下,清洁,现场,和边缘无序的双层石墨烯进行了研究。我们发现,最低的霍尔高原保持不变,在存在的障碍,而不对称破坏高原和电导量子化。此外,我们发现,无序诱导的电导在磁场的存在下,在n-p区域的增强。最后,我们表明,量子霍尔边缘状态之间的平衡独特的掺杂区域导致霍尔平台出现在制度的完整模式混合。

英文摘要:

We investigate the electronic transport properties of unbiased and biased bilayer graphene nanoribbon in n-p and n-n junctions subject to a perpendicular magnetic field. Using the non-equilibrium Green's function method and the Landauer-Büttiker formalism, the conductance is studied for the cases of clean, on-site, and edge disordered bilayer graphene. We show that the lowest Hall plateau remains unchanged in the presence of disorder, whereas asymmetry destroys both the plateaus and conductance quantization. In addition, we show that disorder induces an enhancement of the conductance in the n-p region in the presence of magnetic fields. Finally, we show that the equilibration of quantum Hall edge states between distinctively doped regions causes Hall plateaus to appear in the regime of complete mode mixing.

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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