Floquet Engineering of Nonequilibrium Valley-Polarized Quantum Anomalous Hall Effect with Tunable Chern Number

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2023-03-08 DOI:10.1021/acs.nanolett.2c04651

Fangyang Zhan, Junjie Zeng, Zhuo Chen, Xin Jin, Jing Fan, Tingyong Chen* and Rui Wang*,

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引用次数: 2

Abstract

Here, we propose that Floquet engineering offers a strategy to realize the nonequilibrium quantum anomalous Hall effect (QAHE) with tunable Chern number. Using first-principles calculations and Floquet theorem, we unveil that QAHE related to valley polarization (VP-QAHE) is formed from the hybridization of Floquet sidebands in the two-dimensional family MSi₂Z₄ (M = Mo, W, V; Z = N, P, As) by irradiating circularly polarized light (CPL). Through the tuning of frequency, intensity, and handedness of CPL, the Chern number of VP-QAHE is highly tunable and up to C = ±4, which attributes to light-induced trigonal warping and multiple-band inversion at different valleys. The chiral edge states and quantized plateau of Hall conductance are visible inside the global band gap, thereby facilitating the experimental measurement. Our work not only establishes Floquet engineering of nonequilibrium VP-QAHE with tunable Chern number in realistic materials but also provides an avenue to explore emergent topological phases under light irradiation.

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陈氏数可调谐非平衡谷偏振量子反常霍尔效应的Floquet工程

本文提出用Floquet工程技术实现陈恩数可调的非平衡量子反常霍尔效应(QAHE)。利用第一性原理计算和Floquet定理，揭示了与谷极化相关的qqa (VP-QAHE)是由二维族MSi2Z4 (M = Mo, W, V;通过圆偏振光(CPL)照射Z = N, P, As。通过调整CPL的频率、强度和手性，VP-QAHE的陈氏数具有高度可调性，最高可达C =±4，这归因于光诱导的三角翘曲和不同谷的多波段反转。在全局带隙内可见霍尔电导的手性边缘态和量子化平台，便于实验测量。我们的工作不仅在现实材料中建立了具有可调陈氏数的非平衡态VP-QAHE的Floquet工程，而且为探索光照射下的涌现拓扑相提供了一条途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

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