在二维HgI2层中,强滑动铁电和间层滑动可控制的螺旋电子效应
Xinfeng Chen1, Xinkai Ding1,2, Gaoyang Gou1
1Frontier Institute of Science and Technology, State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China.
Nano letters
|March 1, 2024
概括
研究人员发现了新的2D滑动铁电材料,HgBr2和HgI2,表现出室温铁电. 这些材料通过通过层间滑动控制电子自旋,使新型自旋电子装置成为可能.
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
- 纳米技术纳米技术
背景情况:
- 开发用于先进电子应用的二维 (2D) 材料是一个关键的研究领域.
- 滑动铁电 (FE) 材料为下一代设备提供了独特的功能,但实验发现仍然具有挑战性.
- 2D"slidetronics"领域需要具有可检测铁电性的新材料和新的功能.
研究的目的:
- 识别和描述新的二维 (2D) 滑动铁电材料.
- 探索这些材料在二维自旋电子设备中的潜力.
- 为了研究层间合,铁电和旋转纹理之间的关系.
主要方法:
- 使用第一原理计算来研究范德瓦尔斯 (vdW) 层状晶体HgX2 (X = Br,I).
- 分析堆叠序列和层间合以确定铁电性质.
- 模拟电场对铁电和自旋纹理的影响.
主要成果:
- HgBr2和HgI2被确定为可合成的2D滑动铁电,在室温下具有稳定的平面外铁电.
- 2D HgI2表现出强大的滑动铁电 (高达0.16μC/cm2) 由于强大的层间合和界面电荷重排.
- 在FE-HgI2中介层滑动控制Rashba旋转纹理,使潜在的旋转电子应用成为可能.
结论:
- HgX2 (X = Br,I) 代表了一个新的二维滑动铁电材料类.
- 发现的材料显示了2D滑动电子和旋动电子的实际应用潜力.
- 在2D模式下,使用FE-HgI2层进行电子自旋检测的电控是可行的.
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