Chin. Phys. Lett.  2022, Vol. 39 Issue (4): 047403    DOI: 10.1088/0256-307X/39/4/047403
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Local Density of States Modulated by Strain in Marginally Twisted Bilayer Graphene
Jia-Jun Ma1,2†, Zhen-Yu Wang2†, Shui-Gang Xu3,4, Yu-Xiang Gao1,2, Yu-Yang Zhang1,2,5, Qing Dai6, Xiao Lin1,2,5, Shi-Xuan Du1,2,5, Jindong Ren6*, and Hong-Jun Gao1,2,5*
1Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2School of Physical Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
3Key Laboratory for Quantum Materials of Zhejiang Province, School of Science, Westlake University, Hangzhou 310024, China
4Institute of Natural Sciences, Westlake Institute for Advanced Study, Hangzhou 310024, China
5CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China
6CAS Key Laboratory of Nanophotonic Materials and Devices, CAS Key Laboratory of Standardization and Measurement for Nano-technology, National Center for Nanoscience and Technology, Beijing 100190, China
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Jia-Jun Ma, Zhen-Yu Wang, Shui-Gang Xu et al  2022 Chin. Phys. Lett. 39 047403
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Abstract In marginally twisted bilayer graphene, the Moiré pattern consists of the maximized AB (BA) stacking regions, minimized AA stacking regions and triangular networks of domain walls. Here we realize the strain-modulated electronic structures of marginally twisted bilayer graphene by scanning tunneling microscopy/spectroscopy and density functional theory (DFT) calculations. The experimental data show four peaks near the Fermi energy at the AA regions. DFT calculations indicate that the two new peaks closer to the Fermi level may originate from the intrinsic heterostrain and the electric field implemented by back gate is likely to account for the observed shift of the four peaks. Furthermore, the $dI/dV$ map across Moiré patterns with different strain strengths exhibits a distinct appearance of the helical edge states.
Received: 16 February 2022      Published: 28 March 2022
PACS:  07.79.Cz (Scanning tunneling microscopes)  
  81.05.ue (Graphene)  
  74.78.Fk (Multilayers, superlattices, heterostructures)  
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http://cpl.iphy.ac.cn/10.1088/0256-307X/39/4/047403       OR      http://cpl.iphy.ac.cn/Y2022/V39/I4/047403
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Jia-Jun Ma
Zhen-Yu Wang
Shui-Gang Xu
Yu-Xiang Gao
Yu-Yang Zhang
Qing Dai
Xiao Lin
Shi-Xuan Du
Jindong Ren
and Hong-Jun Gao
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