人工晶体的非扰动电流响应中的.
Christophe De Beule1,2, Võ Tiến Phong1, E J Mele1
1Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104.
概括
人工晶体表现出对电场方向敏感的非线性电流反应. 这种角依赖揭示了关于电子带结构和新材料中的果曲率的关键信息.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学是一种材料科学.
- 固态物理 固态物理
背景情况:
- 具有较大的实空间周期性的二维人造晶体具有独特的电子性质.
- 对电场的非线性电流响应可以编码有关带分散和果曲率的信息.
研究的目的:
- 开发一个理论框架,以了解人工晶体中非线性电流响应的角度依赖.
- 导出分析表达式的当前在一个带投影理论考虑时间逆转和三角对称.
主要方法:
- 使用放松时间近似来获得当前的分析表达式.
- 采用带投影理论与时间逆转和三角对称.
- 扩大目前对实空间转换向量的依赖,以描述曲线模式.
主要成果:
- 导出了驱动电场中非线性电流响应到无限顺序的分析表达式.
- 电流的角依赖被证明形成了对称性受约束的曲线.
- 该理论用定期曲的石墨烯和扭曲的双层石墨烯的计算来说明.
结论:
- 人工晶体中的非线性电流响应提供了一个强大的工具来探测电子带结构和果曲率.
- 衍生的曲线图案提供了基础电子性质的直接实验签名.
- 这些发现可以在特定材料系统的实验相关电场强度下获得.
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