Heterostrain-induced flat bands in untwisted bilayer graphene
杭阳 1张助华1
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作者信息
1. State Key Laboratory of Mechanics and Control for Aerospace Structures,Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education,and Institute for Frontier Science,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China
Twist-induced lattice misalignment of bilayer graphene leads to moire patterns that generate electronic flat bands with strongly correlated electronic states,but it still requires a sophisticated process to precisely control the twist angle.Here,we propose a different way to generate hexagonal moirés in bilayer graphene by uniaxially stretching the two layers along two distinct armchair directions,respectively.The heterostrain-induced moiré gives rise to flat bands near the Fermi level due to the deformation-induced equivalent misaligned angle between two graphene layers,featuring an electronic equivalence of twisted bilayer graphene.We demonstrate the flat bands at a heterostrain of 2.1％,equivalent to the first magic angle of 1.05°.Yet,a slight shift of Dirac point from K point due to the uniaxial strain splits the flat bands into two van Hove singularity peaks that are separated by 18 meV and located above and below the Fermi level,respectively.Our results suggest a potential way to control the electronic strong correlation in bilayer graphene of natural stacking.
关键词
Strain/Bilayer graphene/Flat band/Continuum model
Key words
Strain/Bilayer graphene/Flat band/Continuum model
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基金项目
国家重点研发计划(2019YFA0705400)
National NSF of China(12261160367)
National NSF of China(12225205)
National NSF of China()
National NSF of China(22073048)
江苏高校优势学科建设工程项目()
江苏省自然科学基金(BK20220872)
Jiangsu Funding Program for Excellent Postdoctoral Talent(2022ZB232)
维普
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