标题： 周期性应变影响下石墨烯纳米带的电子和光学性质 显示英文标题

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

摘要： 研究了在单轴周期性应变作用下石墨烯纳米带的电子和光学性质，采用了多种最近邻跳跃模式。 结果表明，通过适当地选择跳跃模式，可以在子带内产生动量分辨的能隙，改变能带结构以表现出凹陷的轮廓，并增强态密度局部峰值强度但减少峰值数量。 波函数的奇偶性发生了变化，导致光学跃迁规则发生变化。 通过对拉伸GNR的波函数奇偶性进行了严格的数学证明，从而确定了拉伸GNR的光学选择定则。 吸收曲线是由减小的速度矩阵元和增加的联合态密度之间的复杂相互作用引起的。 显示英文摘要

摘要： 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.