铁电与与之相关的库伦选在范德瓦尔斯异构结构中的铁电
Ruirui Niu1, Zhuoxian Li1, Xiangyan Han1
1State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing, China.
Nature nanotechnology
|January 15, 2025
概括
研究人员在没有moiré模式的范德瓦尔斯异构结构中发现了界面铁电. 这一突破利用了化 (BN) 层中的堆叠缺陷,为电子设备提供了新的可能性.
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
- 纳米技术 纳米技术
背景情况:
- 在非中心对称的范德瓦尔斯 (vdW) 异构结构中观察到的界面铁电性具有可调节的电子特性.
- 以前的实现仅限于双层石墨烯moiré超级格子,要求特定的材料和扭曲角度.
- 铁电与库伦选可以调节超导,拓电流和突触行为.
研究的目的:
- 为了研究vdW异构结构的铁电,超越莫雷超级格子.
- 在结合单层石墨烯,化 (BN) 和过渡金属化的系统中探索铁电.
- 为了确定铁电的起源及其用于设备应用的机制.
主要方法:
- 包括BN/单层石墨烯/BN和BN/WSe2/单层石墨烯/WSe2/BN在内的异构结构的制造.
- 在制造的vdW异构结构中对铁电歇斯底里反应的表征.
- 控制实验以排除替代机制并确认铁电的来源.
主要成果:
- 在BN/单层石墨烯/BN和BN/WSe2/单层石墨烯/WSe2/BN异构结构中观察到铁电歇斯底里反应.
- 铁电还可以使用多层扭曲的MoS2,一种已知的滑动铁电,而不是BN.
- 控制实验证实了BN片中的堆叠故障是铁电的来源.
结论:
- 这些vdW异构结构中的铁电源源源自BN层中的堆叠断层,而不是moiré模式.
- 观察到的歇斯底里切换涉及导电性铁电,选隔离场,并通过极化控制单层石墨烯.
- 这一发现缓解了设备应用的限制,使其能够与超导,拓或磁性VDW材料集成.
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