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在双层石墨烯中,由门定义的量子点接触之间聚焦的光谱电子接触

Josep Ingla-Aynés¹, Antonio L R Manesco¹, Talieh S Ghiasi¹

¹Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.

|June 8, 2023

概括

我们使用量子点接触观察了双层石墨烯中的镜面电子反射,使相连贯传输成为可能. 这一发现对于开发先进的valleytronic设备和弹道互连至关重要.

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.
量子电子学量子电子学

背景情况:

双层石墨烯 (BLG) 由于其多层结构,具有独特的电子特性.
量子点接触 (QPC) 对于控制和探测纳米设备中的电子传输至关重要.
了解弹道通道中的电子行为是未来电子应用的关键.

研究的目的:

研究尺寸量化和三角形曲线对BLG中横向电子聚焦 (TEF) 的影响.
在弹道BLG通道中,分析网关定义边缘的电子反射特性.
探索BLG在新型电子和valleytronic设备中的潜力.

主要方法:

制造一个多终端弹道双层石墨烯通道.
使用静电门来定义多个自旋和谷退化量子点接触 (QPC).
进行横向电子聚焦 (TEF) 测量,使用不同的QPC几何形状和晶体学方向.

主要成果:

在TEF光谱中观察到八个清晰的峰值,具有可比的幅度,表明有镜状电子反射.
在低温下证明了相连贯传输和弱量子干扰特征.
展示了高达100K的TEF峰值的可见性,尽管有小的门诱导带隙 (45 meV).

结论:

门界定的边缘的镜面反射保留了伪旋转信息,这对valleytronics至关重要.
在BLG通道中的弹道运输在各种温度范围内是可实现的和坚固的.
结果为实现下一代valleytronic设备中的弹道互连铺平了道路.

关键词:

弹道运输的运输方式两层石墨烯的两个层.量子点接触点是指量子点的接触点.三角形曲线的变形

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