The electronic and optical properties of graphene nanoribbons under the influence of the periodic strain

IF 2.8 3区 物理与天体物理 Q2 PHYSICS, CONDENSED MATTER
Chunwen Zhang , W.X. Yan
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引用次数: 0

Abstract

The electronic and optical properties of graphene nanoribbons under uniaxial periodic strain have been explored using various nearest-neighbor hopping patterns. It is found that by properly selecting hopping patterns, momentum-resolved gaps within minibands emerge, modifying the energy band structure to exhibit hollowed-out profiles, and enhancing peak intensity in local density of states but reducing peak count. The optical transitions are impacted by altered parity symmetry of wavefunctions, causing changes in optical selection rules. The parity of wavefunctions for strained GNRs has been established through rigorous mathematical proof, whereby the optical selection rule is determined for the strained GNRs. The absorption curves arise from a complex interplay between diminished velocity matrix elements and escalated joint density of states.
周期应变影响下石墨烯纳米带的电子和光学特性
我们利用各种近邻跳变模式探索了单轴周期应变下石墨烯纳米带的电子和光学特性。研究发现,通过适当选择跳变模式,微型带内出现了动量分辨间隙,从而改变了能带结构,使其呈现出空心轮廓,并增强了局部态密度的峰值强度,但减少了峰值数量。波函数奇偶对称性的改变会影响光学转变,从而导致光学选择规则的改变。应变 GNR 的波函数奇偶性是通过严格的数学证明确定的,从而确定了应变 GNR 的光学选择规则。吸收曲线产生于速度矩阵元素的减少和状态联合密度的增加之间复杂的相互作用。
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来源期刊
Physica B-condensed Matter
Physica B-condensed Matter 物理-物理:凝聚态物理
CiteScore
4.90
自引率
7.10%
发文量
703
审稿时长
44 days
期刊介绍: Physica B: Condensed Matter comprises all condensed matter and material physics that involve theoretical, computational and experimental work. Papers should contain further developments and a proper discussion on the physics of experimental or theoretical results in one of the following areas: -Magnetism -Materials physics -Nanostructures and nanomaterials -Optics and optical materials -Quantum materials -Semiconductors -Strongly correlated systems -Superconductivity -Surfaces and interfaces
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