通过栅极定义的 Moiré 屏障实现双层石墨烯扭转中的电子准直

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2024-09-24 DOI:10.1021/acs.nanolett.4c03373

Wei Ren, Xi Zhang, Ziyan Zhu, Moosa Khan, Kenji Watanabe, Takashi Taniguchi, Efthimios Kaxiras, Mitchell Luskin, Ke Wang

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引用次数: 0

摘要

通过石墨烯 p-n 结的电子准直，可以对弹道电子轨迹进行类似光路的静电控制。对扭曲双层石墨烯（tBLG）中的新型相关电子相位进行类似操作，可以为实现先进量子电子学的基础物理学和器件组件提供额外的探针。在这项工作中，我们利用摩尔纹超晶格的带绝缘体间隙，在 tBLG 器件中通过栅极定义的摩尔纹势垒演示了电子流的准直化。我们可以调整单个结，使其容纳所选的传统伪势垒和摩尔纹隧道势垒组合，从而提高准直效率。通过测量通过两个相距 1 μm 的连续莫伊里准直器的传输，我们证明了 tBLG 在现实扭曲角不均匀性情况下的电子准直。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Electron Collimation in Twisted Bilayer Graphene via Gate-Defined Moiré Barriers

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Electron Collimation in Twisted Bilayer Graphene via Gate-Defined Moiré Barriers

Electron collimation via a graphene p–n junction allows electrostatic control of ballistic electron trajectories akin to that of an optical circuit. Similar manipulation of novel correlated electronic phases in twisted-bilayer graphene (tBLG) can provide additional probes to the underlying physics and device components toward advanced quantum electronics. In this work, we demonstrate collimation of the electron flow via gate-defined moiré barriers in a tBLG device, utilizing the band-insulator gap of the moiré superlattice. A single junction can be tuned to host a chosen combination of conventional pseudo barrier and moiré tunnel barriers, from which we demonstrate improved collimation efficiency. By measuring transport through two consecutive moiré collimators separated by 1 μm, we demonstrate evidence of electron collimation in tBLG in the presence of realistic twist-angle inhomogeneity.

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.