Tunable Sample-wide Electronic Kagome Lattice in Low-angle Twisted Bilayer Graphene

Fuente: arXiv
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Main Authors: Zheng, Qi, Hao, Chen-Yue, Zhou, Xiao-Feng, Zhao, Ya-Xin, He, Jia-Qi, He, Lin
Format: Preprint
Published: 2022
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author Zheng, Qi
Hao, Chen-Yue
Zhou, Xiao-Feng
Zhao, Ya-Xin
He, Jia-Qi
He, Lin
author_facet Zheng, Qi
Hao, Chen-Yue
Zhou, Xiao-Feng
Zhao, Ya-Xin
He, Jia-Qi
He, Lin
contents Overlaying two graphene layers with a small twist angle can create a moire superlattice to realize exotic phenomena that are entirely absent in graphene monolayer. A representative example is the predicted formation of localized pseudo-Landau levels (PLLs) with Kagome lattice in tiny-angle twisted bilayer graphene (TBG) with theta < 0.3 deg when the graphene layers are subjected to different electrostatic potentials. However, this was shown only for the model of rigidly rotated TBG which is not realized in reality due to an interfacial structural reconstruction. It is believed that the interfacial structural reconstruction strongly inhibits the formation of the PLLs. Here, we systematically study electronic properties of the TBG with 0.075 deg < theta < 1.2 deg and demonstrate, unexpectedly, that the PLLs are quite robust for all the studied TBG. The structural reconstruction suppresses the formation of the emergent Kagome lattice in the tiny-angle TBG. However, for the TBG around magic angle, the sample-wide electronic Kagome lattices with tunable lattice constants are directly imaged by using scanning tunneling microscope. Our observations open a new direction to explore exotic correlated phases in moire systems.
format Preprint
id arxiv_https___arxiv_org_abs_2207_12670
institution arXiv
publishDate 2022
record_format arxiv
spellingShingle Tunable Sample-wide Electronic Kagome Lattice in Low-angle Twisted Bilayer Graphene
Zheng, Qi
Hao, Chen-Yue
Zhou, Xiao-Feng
Zhao, Ya-Xin
He, Jia-Qi
He, Lin
Mesoscale and Nanoscale Physics
Materials Science
Overlaying two graphene layers with a small twist angle can create a moire superlattice to realize exotic phenomena that are entirely absent in graphene monolayer. A representative example is the predicted formation of localized pseudo-Landau levels (PLLs) with Kagome lattice in tiny-angle twisted bilayer graphene (TBG) with theta < 0.3 deg when the graphene layers are subjected to different electrostatic potentials. However, this was shown only for the model of rigidly rotated TBG which is not realized in reality due to an interfacial structural reconstruction. It is believed that the interfacial structural reconstruction strongly inhibits the formation of the PLLs. Here, we systematically study electronic properties of the TBG with 0.075 deg < theta < 1.2 deg and demonstrate, unexpectedly, that the PLLs are quite robust for all the studied TBG. The structural reconstruction suppresses the formation of the emergent Kagome lattice in the tiny-angle TBG. However, for the TBG around magic angle, the sample-wide electronic Kagome lattices with tunable lattice constants are directly imaged by using scanning tunneling microscope. Our observations open a new direction to explore exotic correlated phases in moire systems.
title Tunable Sample-wide Electronic Kagome Lattice in Low-angle Twisted Bilayer Graphene
topic Mesoscale and Nanoscale Physics
Materials Science
url https://arxiv.org/abs/2207.12670