Floquet-Engineering Topological Phase Transition in Graphene Nanoribbons by Light  

作　　者：Anhua Huang Shasha Ke Ji-Huan Guan Jun Li Wen-Kai Lou 黄安华;柯莎莎;关济寰;李俊;娄文凯(SKLSM,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China;College of Materials Science and Opto-electronic Technology,Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Department of Physics,School of Physical Science and Technology,Xiamen University,Xiamen 361005,China)

机构地区：[1]SKLSM,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China [2]College of Materials Science and Opto-electronic Technology,Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China [3]Department of Physics,School of Physical Science and Technology,Xiamen University,Xiamen 361005,China

出　　处：《Chinese Physics Letters》2024年第9期69-87,共19页中国物理快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.92265203 and 11974340);the Strategic Priority Research Program of the Chinese Academy of Sciences(Grants Nos.XDB0460000,XDB28000000,and XDPB22);the Innovation Program for Quantum Science and Technology(Grant No.2024ZD0300104);the National Key Research and Development Program of China(Grant No.2018YFA0306101)。

摘　　要：Quasi-one-dimensional(1D)graphene nanoribbons(GNRs)play a crucial role in advancement of nextgeneration devices.Recent studies have suggested their potential to exhibit unique symmetry-protected topological phases defined by a Z_(2) invariant.By employing both the tight-binding model and the Floquet theory,our investigation demonstrates the effective control of the topological phase within quasi-1D armchair GNRs(AGNRs)using elliptically polarized light,unveiling rich topological phase diagrams.Specifically,we observe that varying the amplitude of the light can induce transitions in the band gap(E_(g))of AGNRs,leading to multiple changes in the system’s Z_(2) invariant.Furthermore,for heterojunctions composed of different AGNR segments,the junction state can be either created or eliminated by the application of elliptically polarized light.

关 键 词：TOPOLOGICAL POLARIZED TRANSITION 

分 类 号：O469[理学—凝聚态物理]