Floquet-Engineering Topological Phase Transition in Graphene Nanoribbons by Light

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外文摘要：Quasi-one-dimensional(1D)graphene nanoribbons(GNRs)play a crucial role in advancement of next-generation devices.Recent studies have suggested their potential to exhibit unique symmetry-protected topolog-ical phases defined by a Z2 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(AG-NRs)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(Eg)of AGNRs,leading to multiple changes in the system's Z2 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.

作者：

黄安华、柯莎莎、关济寰、李俊、娄文凯

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作者单位：

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

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaStrategic Priority Research Program of the Chinese Academy of SciencesStrategic Priority Research Program of the Chinese Academy of SciencesStrategic Priority Research Program of the Chinese Academy of SciencesInnovation Program for Quantum Science and TechnologyNational Key Research and Development Program of China

项目编号：

9226520311974340XDB0460000XDB28000000XDPB222024ZD03001042018YFA0306101

出版年：

2024

DOI：

10.1088/0256-307X/41/9/097302

中国物理快报(英文版)

中国科学院物理研究所,中国物理学会

中国物理快报(英文版)

CSTPCDEI

影响因子：0.515

ISSN：0256-307X

年,卷(期)：2024.41(9)