完全松弛扭曲双层和三层石墨烯中的伪磁场

IF 4.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

2D Materials Pub Date : 2024-04-30 DOI:10.1088/2053-1583/ad3b0e

A Ceferino, F Guinea

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引用次数: 0

摘要

我们提出了描述扭曲双层和对称扭曲三层石墨烯平面内和平面外晶格弛豫的简单模型。分析结果和数列展开表明，对于扭转角θ>1.4∘，面内原子位移导致的伪磁场微弱地依赖于θ。弛豫引起的伪谱电势以及层间二聚体和非二聚体对之间的相关能量差共同作用，导致扭曲双层和三层石墨烯中的电子-空穴显著不对称。

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Pseudomagnetic fields in fully relaxed twisted bilayer and trilayer graphene

We present simple models to describe the in-plane and the out-of-plane lattice relaxation in twisted bilayer and symmetrically twisted trilayer graphene. Analytical results and series expansions show that for twist angles

θ>1.4∘

, the in-plane atomic displacements lead to pseudomagnetic fields weakly dependent on θ. In symmetrically twisted trilayer graphene, the central layer in-plane relaxation is greatly enhanced. The joint effect of the relaxation-induced pseudoscalar potentials and the associated energy difference between interlayer dimer and non-dimer pairs resulted in a significant electron–hole asymmetry both in twisted bilayer and trilayer graphene.

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来源期刊

2D Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

10.70

自引率

5.50%

发文量

138

审稿时长

1.5 months

期刊介绍： 2D Materials is a multidisciplinary, electronic-only journal devoted to publishing fundamental and applied research of the highest quality and impact covering all aspects of graphene and related two-dimensional materials.