大山谷偏振和山谷依赖的霍尔效应在Janus TiTeBr单层中
Bingwen Su1, Xiao Peng1, Zhibo Yan1
1Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China. bwsu@smail.nju.edu.cn.
Physical chemistry chemical physics : PCCP
|April 2, 2024
概括
研究人员发现了TiTeBr单层作为一个有前途的铁路道材料. 这种材料表现出高基里温度和显著的谷极化,使新的电子设备应用成为可能.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 量子力学就是量子力学.
背景情况:
- 在valleytronics中,Ferrovalley材料对于开发先进的逻辑和内存设备至关重要.
- 现有的铁路谷材料往往缺乏足够的谷极化和高基里温度.
- 需要新的材料来推进valleytronic的应用.
研究的目的:
- 预测和识别具有理想性质的新型铁路材料.
- 为了研究TiTeBr单层在valleytronics中的潜力.
- 探索电场和应变对TiTe.Br电子特性的影响.
主要方法:
- 使用第一原则计算来预测材料的性质.
- 扰动理论被用来验证山谷极化,考虑到旋转极化和旋转轨道合.
- 在电场和应变下进行了贝里曲率的分析.
主要成果:
- TiTeBr单层表现出内在的铁磁性,其基里温度 (TC) 为220K.
- 外平面磁化在价值带中产生了113 meV的谷极化.
- 在平面电场诱导异常的山谷霍尔效应 (AVHE) 由于山谷依赖的果曲率.
- 在平面内双轴应变将TiTeBr转化为切尔恩绝缘体,使量子异常谷霍尔效应 (QAVHE) 成为可能.
结论:
- TiTeBr单层是铁路应用的有前途的候选材料.
- 这种材料为研究山谷依赖的霍尔效应提供了一个新的平台.
- 预测的特性为下一代valleytronic设备铺平了道路.
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