Quantitative determination of twist angle and strain in Van der Waals moiré superlattices

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED Applied Physics Letters Pub Date : 2024-09-13 DOI:10.1063/5.0223777

Steven J. Tran, Jan-Lucas Uslu, Mihir Pendharkar, Joe Finney, Aaron L. Sharpe, Marisa Hocking, Nathan J. Bittner, Kenji Watanabe, Takashi Taniguchi, Marc A. Kastner, Andrew J. Mannix, David Goldhaber-Gordon

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Abstract

Scanning probe techniques are popular, nondestructive ways to visualize the real space structure of Van der Waals moirés. The high lateral spatial resolution provided by these techniques enables extracting the moiré lattice vectors from a scanning probe image. We have found that the extracted values, while precise, are not necessarily accurate. Scan-to-scan variations in the behavior of the piezos that drive the scanning probe and thermally driven slow relative drift between probe and sample produce systematic errors in the extraction of lattice vectors. In this Letter, we identify the errors and provide a protocol to correct for them. Applying this protocol to an ensemble of ten successive scans of near-magic-angle twisted bilayer graphene, we are able to reduce our errors in extracting lattice vectors to less than 1%. This translates to extracting twist angles with a statistical uncertainty less than 0.001° and uniaxial heterostrain with uncertainty on the order of 0.002%.

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范德瓦耳斯摩尔超晶格扭转角和应变的定量测定

扫描探针技术是观察范德华摩尔纹真实空间结构的常用无损方法。这些技术具有很高的横向空间分辨率，可以从扫描探针图像中提取摩尔晶格矢量。我们发现，提取的值虽然精确，但并不一定准确。驱动扫描探针的压电体在扫描过程中的行为变化，以及探针和样品之间热驱动的缓慢相对漂移，都会在提取晶格矢量时产生系统误差。在这封信中，我们确定了这些误差，并提供了纠正这些误差的方案。在对近乎神奇角度扭曲的双层石墨烯进行十次连续扫描后，我们能够将提取晶格矢量的误差降低到 1%以下。这意味着提取扭曲角度的统计不确定性小于 0.001°，提取单轴异应变的不确定性约为 0.002%。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.