Floquet-Engineering Topological Phase Transition in Graphene Nanoribbons by Light

黄安华 ¹柯莎莎 ¹关济寰 ¹李俊 ²娄文凯¹

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作者信息

1. 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
2. Department of Physics,School of Physical Science and Technology,Xiamen University,Xiamen 361005,China
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Abstract

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.

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基金项目

National Natural Science Foundation of China(92265203)

National Natural Science Foundation of China(11974340)

Strategic Priority Research Program of the Chinese Academy of Sciences(XDB0460000)

Strategic Priority Research Program of the Chinese Academy of Sciences(XDB28000000)

Strategic Priority Research Program of the Chinese Academy of Sciences(XDPB22)

Innovation Program for Quantum Science and Technology(2024ZD0300104)

National Key Research and Development Program of China(2018YFA0306101)

出版年

2024

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)

CSTPCDCSCDEI

影响因子：0.515

ISSN：0256-307X

参考文献量46

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