{"title":"Light-induced above-room-temperature Chern insulators in group-IV Xenes","authors":"Zhe Li, Haijun Cao, Sheng Meng","doi":"10.1038/s41524-025-01662-x","DOIUrl":null,"url":null,"abstract":"<p>Floquet engineering provides a versatile platform for realizing and manipulating diverse exotic topological phases inaccessible in equilibrium. Under the irradiation of circularly or elliptically polarized light, the sizable spin-orbit couplings in group-IV Xene materials (e.g., silicene, germanene, stanene) lead to topological phase transitions (TPT) from quantum spin Hall (QSH) to quantum anomalous Hall (QAH) states, governed by spin-degeneracy broken with band closing and reopening process in one of the spin components. Fascinatingly, a large gapped (≥35 meV) QAH effect with a Chern number <i>C</i> = ± 2 can be introduced under a wide range of laser parameters, lifting limitations of conventional atomic building blocks to achieve long-range magnetism and enabling Chern-insulating behaviors above room temperature. A complex phase diagram for such TPTs is predicted. This work addresses transitions between two-dimensional QSH and QAH states via Floquet engineering, which will stimulate experimental realization of above-room-temperature QAH in group-IV Xenes.</p>","PeriodicalId":19342,"journal":{"name":"npj Computational Materials","volume":"3 1","pages":""},"PeriodicalIF":9.4000,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"npj Computational Materials","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1038/s41524-025-01662-x","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Floquet engineering provides a versatile platform for realizing and manipulating diverse exotic topological phases inaccessible in equilibrium. Under the irradiation of circularly or elliptically polarized light, the sizable spin-orbit couplings in group-IV Xene materials (e.g., silicene, germanene, stanene) lead to topological phase transitions (TPT) from quantum spin Hall (QSH) to quantum anomalous Hall (QAH) states, governed by spin-degeneracy broken with band closing and reopening process in one of the spin components. Fascinatingly, a large gapped (≥35 meV) QAH effect with a Chern number C = ± 2 can be introduced under a wide range of laser parameters, lifting limitations of conventional atomic building blocks to achieve long-range magnetism and enabling Chern-insulating behaviors above room temperature. A complex phase diagram for such TPTs is predicted. This work addresses transitions between two-dimensional QSH and QAH states via Floquet engineering, which will stimulate experimental realization of above-room-temperature QAH in group-IV Xenes.
期刊介绍：
npj Computational Materials is a high-quality open access journal from Nature Research that publishes research papers applying computational approaches for the design of new materials and enhancing our understanding of existing ones. The journal also welcomes papers on new computational techniques and the refinement of current approaches that support these aims, as well as experimental papers that complement computational findings.
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