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Tunable van Hove singularities and correlated states in twisted monolayer–bilayer graphene

Xu, Shuigang; Al Ezzi, Mohammed M.; Balakrishnan, Nilanthy; Garcia-Ruiz, Aitor; Tsim, Bonnie; Mullan, Ciaran; Barrier, Julien; Xin, Na; Piot, Benjamin A.; Taniguchi, Takashi; Watanabe, Kenji; Carvalho, Alexandra; Mishchenko, Artem; Geim, A.K.; Fal’ko, Vladimir I.; Adam, Shaffique; Castro Neto, Antonio Helio; Novoselov, Kostya S.; Shi, Yanmeng

Authors

Shuigang Xu

Mohammed M. Al Ezzi

Aitor Garcia-Ruiz

Bonnie Tsim

Ciaran Mullan

Julien Barrier

Na Xin

Benjamin A. Piot

Takashi Taniguchi

Kenji Watanabe

Alexandra Carvalho

Artem Mishchenko

A.K. Geim

Vladimir I. Fal’ko

Shaffique Adam

Antonio Helio Castro Neto

Kostya S. Novoselov

Yanmeng Shi



Abstract

Understanding and tuning correlated states is of great interest and significance to modern condensed matter physics. The recent discovery of unconventional superconductivity and Mott-like insulating states in magic-angle twisted bilayer graphene (tBLG) presents a unique platform to study correlation phenomena, in which the Coulomb energy dominates over the quenched kinetic energy as a result of hybridized flat bands. Extending this approach to the case of twisted multilayer graphene would allow even higher control over the band structure because of the reduced symmetry of the system. Here, we study electronic transport properties in twisted trilayer graphene (tTLG, bilayer on top of monolayer graphene heterostructure). We observed the formation of van Hove singularities which are highly tunable by twist angle and displacement field and can cause strong correlation effects under optimum conditions, including superconducting states. We provide basic theoretical interpretation of the observed electronic structure.

Journal Article Type Article
Acceptance Date Jan 8, 2021
Online Publication Date Feb 18, 2021
Publication Date 2021-05
Journal Nature Physics
Print ISSN 1745-2473
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 17
Pages 619–626
DOI https://doi.org/10.1038/s41567-021-01172-9
Publisher URL https://www.nature.com/articles/s41567-021-01172-9

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