Journal
NANO LETTERS
Volume 16, Issue 8, Pages 5053-5059Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b01906
Keywords
Twisted bilayer graphene; van Hove singularity; Moire superlattice; topological transition
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Funding
- DFG [Priority Program SPP 1459]
- NYU Shanghai
- NYU-ECNU Institute of Physics
- NSFC Research Fund for International Young Scientists [11550110177]
- Elemental Strategy Initiative
- JSPS
- Grants-in-Aid for Scientific Research [25107005] Funding Source: KAKEN
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van Hove singularities (VHS's) in the density of states play an outstanding and diverse role for the electronic and thermodynamic properties of crystalline solids. At the critical point the Fermi surface connectivity changes, and topological properties undergo a transition. Opportunities to systematically pass a VHS at the turn of a voltage knob and study its diverse impact are however rare. With the advent of van der Waals heterostructures, control over the atomic registry of neighboring graphene layers offers an unprecedented tool to generate a low energy VHS easily accessible with conventional gating. Here we have addressed magnetotransport when the chemical potential crosses the twist angle induced VHS in twisted bilayer graphene. A topological phase transition is experimentally disclosed in the abrupt conversion of electrons to holes or vice versa, a loss of a nonzero Berry phase and distinct sequences of integer quantum Hall states above and below the singularity.
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