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Ultrahigh-resolution scanning microwave impedance microscopy of moiré lattices and superstructures

Two-dimensional heterostructures composed of layers with slightly different lattice vectors exhibit new periodic structure known as moiré lattices, which, in turn, can support novel correlated and topological phenomena. Moreover, moiré superstructures can emerge from multiple misaligned moiré lattic...

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Published in:Science advances 2020-12, Vol.6 (50)
Main Authors: Lee, Kyunghoon, Utama, M Iqbal Bakti, Kahn, Salman, Samudrala, Appalakondaiah, Leconte, Nicolas, Yang, Birui, Wang, Shuopei, Watanabe, Kenji, Taniguchi, Takashi, Altoé, M Virginia P, Zhang, Guangyu, Weber-Bargioni, Alexander, Crommie, Michael, Ashby, Paul D, Jung, Jeil, Wang, Feng, Zettl, Alex
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cited_by cdi_FETCH-LOGICAL-c483t-190493a4b140d3768a3224923d7ca0c640542278c070b7633535d91ae6714e463
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container_issue 50
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container_title Science advances
container_volume 6
creator Lee, Kyunghoon
Utama, M Iqbal Bakti
Kahn, Salman
Samudrala, Appalakondaiah
Leconte, Nicolas
Yang, Birui
Wang, Shuopei
Watanabe, Kenji
Taniguchi, Takashi
Altoé, M Virginia P
Zhang, Guangyu
Weber-Bargioni, Alexander
Crommie, Michael
Ashby, Paul D
Jung, Jeil
Wang, Feng
Zettl, Alex
description Two-dimensional heterostructures composed of layers with slightly different lattice vectors exhibit new periodic structure known as moiré lattices, which, in turn, can support novel correlated and topological phenomena. Moreover, moiré superstructures can emerge from multiple misaligned moiré lattices or inhomogeneous strain distributions, offering additional degrees of freedom in tailoring electronic structure. High-resolution imaging of the moiré lattices and superstructures is critical for understanding the emerging physics. Here, we report the imaging of moiré lattices and superstructures in graphene-based samples under ambient conditions using an ultrahigh-resolution implementation of scanning microwave impedance microscopy. Although the probe tip has a gross radius of ~100 nm, spatial resolution better than 5 nm is achieved, which allows direct visualization of the structural details in moiré lattices and the composite super-moiré. We also demonstrate artificial synthesis of novel superstructures, including the Kagome moiré arising from the interplay between different layers.
doi_str_mv 10.1126/sciadv.abd1919
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SciAdv r-articles
title Ultrahigh-resolution scanning microwave impedance microscopy of moiré lattices and superstructures
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