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Local thermodynamic measurements of topological states in magic angle graphene

ORAL · Invited

Abstract

The discovery of robust superconductivity and correlated ground states in magic-angle twisted graphene devices has generated great interest due in part to the possibility of realizing topological phases and unconventional superconductors in a single material system. In this talk I will describe local compressibility measurements of topological states in magic-angle twisted bilayer graphene, including fractional Chern insulators, which arise due to the interplay of electron-electron interactions and band topology. I will also present recent results on magic-angle twisted trilayer graphene, in which a rich sequence of transitions near charge neutrality is observed, and discuss how these and other ongoing experiments shed new light on the electronic properties of magic-angle graphene systems.

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Publication: Y. Xie*, A. T. Pierce*, J. M. Park*, D. E. Parker, E. Khalaf, P. Ledwith, Y. Cao, S. H. Lee, S. Chen, P. R. Forrester, K. Watanabe, T. Taniguchi, A. Vishwanath, P. Jarillo-Herrero and A. Yacoby. Fractional Chern insulators in magic-angle twisted bilayer graphene. Nature, accepted (2021). Preprint available online at https://arxiv.org/abs/2107.10854<br><br>A. T. Pierce*, Y. Xie*, J. M. Park*, E. Khalaf*, S. H. Lee, Y. Cao, D. E. Parker, P. R. Forrester, S. Chen, K. Watanabe, T. Taniguchi, A. Vishwanath, P. Jarillo-Herrero and A. Yacoby. Unconventional sequence of correlated Chern insulators in magic-angle twisted bilayer graphene. Nat. Phys. (2021). Advance online publication. https://doi.org/10.1038/s41567-021-01347-4

Presenters

  • Andrew T Pierce

    Harvard University, Harvard

Authors

  • Andrew T Pierce

    Harvard University, Harvard