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arXiv 0901.4780cond-mat.mes-hall
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具有非中心对称超晶格势的石墨烯的可调带隙

Tunable Band Gap in Graphene with a Non-Centrosymmetric Superlattice Potential

Rakesh P Tiwari, D. Stroud

摘要:

我们表明,如果石墨烯受到从外部超晶格的潜力,一个带隙的狄拉克点提供的超晶格潜在的破坏反转对称性。作为一个数值例子,我们计算了石墨烯的能带结构的存在下,由于周期性图案化的栅极排列在一个三角形的石墨烯超晶格(TGS)的反转对称性破缺的外部电位,并发现一个带隙创建在原始和“第二代”狄拉克点。原则上,可以通过改变TGS的外部电势和晶格常数来控制间隙。

英文摘要:

We show that, if graphene is subjected to the potential from an external superlattice, a band gap develops at the Dirac point provided the superlattice potential has broken inversion symmetry. As a numerical example, we calculate the band structure of graphene in the presence of an external potential due to periodically patterned gates arranged in a triangular graphene superlattice (TGS) with broken inversion symmetry, and find that a band gap is created at both the original and "second generation" Dirac point. The gap can be controlled, in principle, by changing the external potential and the lattice constant of the TGS.

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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