在Ti-Cr-C MXenes中的常规和谷极化量子异常大厅相
Subhendu Mishra1, Ranjan Kumar Barik1,2, Abhishek K Singh1
1Materials Research Centre, Indian Institute of Science, Bangalore 560012, India.
Nano letters
|December 15, 2025
概括
研究人员发现了展示量子异常霍尔 (QAH) 和谷极化QAH (VP-QAH) 效应的新材料. 这些发现通过实现无散射边缘传输来推进低功耗电子和山谷电子.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 量子现象是一种量子现象.
背景情况:
- 量子异常霍尔 (QAH) 和谷极化QAH (VP-QAH) 效应对于低功率电子和谷电子非常重要,因为它们具有无散射边缘传输.
- 识别表现出QAH和VP-QAH效应的单一材料是一个重大挑战.
研究的目的:
- 开发一种计算选方法,用于识别功能化Ti-Cr-C MXenes中的QAH和VP-QAH效应.
- 探索这些材料在先进电子和valleytronic应用中的潜力.
主要方法:
- 第一原则选方法应用于100个非中心对称的Ti-Cr-C MXenes.
- 分析动态稳定性,磁性基态和拓性质.
- 研究异构结构和电场诱导的效应.
主要成果:
- 确定了28个动态稳定的Ti-Cr-C MXenes,其中14个表现出平面内和13个平面外的铁磁性.
- 铁磁Ti-Cr-C-H-OCN MXene显示了QAH的效应.
- Ti-Cr-C-CN-Cl 和 Ti-Cr-C-SCN-O MXenes 呈现出应变诱导的 VP-QAH 效应.
- 一个压缩的Ti-Cr-C-H-OCN MXene/2H-CrS异构结构承载着VP-QAH效应.
- 观察到电场诱导的拓相变和显著的山谷极化.
结论:
- 功能化的Ti-Cr-C MXenes是承载QAH和VP-QAH效应的有希望的候选者.
- 鉴定到的材料和异构结构表明了下一代低功耗电子产品和山谷电子产品的潜力.
- 对拓性质的电场控制为新型设备功能开辟了道路.
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