外电场和载流子掺杂下双层石墨烯的结构调制

IF 2.3 4区物理与天体物理 Q3 PHYSICS, APPLIED

Applied Physics Express Pub Date : 2024-03-15 DOI:10.35848/1882-0786/ad2ecc

Nadia Sultana, Yanlin Gao, Mina Maruyama and Susumu Okada

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引用次数: 0

摘要

我们利用密度泛函理论研究了外电场和载流子掺杂作用下双层石墨烯的几何结构。我们的计算揭示了外电场和空穴注入对决定双层石墨烯几何结构的关键影响。当增加空穴掺杂浓度时，石墨烯的键长单调增加，而它对电子掺杂仍然不敏感。此外，积累的载流子主要分布在栅极下方的最外层。这些结果使我们能够在双层石墨烯中构建摩尔纹超晶格，并根据载流子浓度的不同而具有不同的摩尔纹周期性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Structural modulation of bilayer graphene under an external electric field and carrier doping

Density functional theory was used to investigate the geometric structure of bilayer graphene under an external electric field with carrier doping. Our calculations revealed the crucial impact of external electric fields and the hole injection on determining the geometric structure of bilayer graphene. The bond length of graphene monotonically increased when increasing the hole doping concentration, while it remained insensitive to electron doping. Additionally, there accumulated carriers predominantly distributed in the outermost layer located just below the gate electrode. These results enabled the construction of moiré superlattices in the bilayer graphene, possessing different moiré periodicity depending on the carrier concentration.

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来源期刊

Applied Physics Express 物理-物理：应用

CiteScore

4.80

自引率

8.70%

发文量

310

审稿时长

1.2 months

期刊介绍： Applied Physics Express (APEX) is a letters journal devoted solely to rapid dissemination of up-to-date and concise reports on new findings in applied physics. The motto of APEX is high scientific quality and prompt publication. APEX is a sister journal of the Japanese Journal of Applied Physics (JJAP) and is published by IOP Publishing Ltd on behalf of the Japan Society of Applied Physics (JSAP).