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.

*This work was primarily supported by the U.S. Department of Energy, the Gordon and Betty Moore Foundation, the U.S. Army Research Office, the U. S. National Science Foundation, and the National Defense Science and Engineering Graduate Fellowship program (NDSEG).

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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

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