Tunable van Hove Singularities and Correlated States in Twisted Monolayer-bilayer Graphene

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

Tunable van Hove Singularities and Correlated States in Twisted Monolayer-bilayer Graphene

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

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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 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 monolayer-bilayer graphene (a bilayer on top of monolayer graphene heterostructure). We observed the formation of van Hove singularities which are highly tunable by changing either the twist angle or external electric field and can cause strong correlation effects under optimum conditions. We provide basic theoretical interpretations of the observed electronic structure.

Original language	English
Journal	Nature Physics
Publication status	Accepted/In press - 8 Jan 2021

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National Graphene Institute

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https://arxiv.org/abs/2004.12414

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Xu, S., Ezzi, M. M. A., Balakrishnan, N., Garcia-Ruiz, A., Tsim, B., Mullan, C., Barrier, J., Xin, N., Piot, B. A., Taniguchi, T., Katayama, K., Carvalho, A., Mishchenko, A., Geim, A., Fal'ko, V., Adam, S., Neto, A. H. C., Novoselov, K., & Shi, Y. (Accepted/In press). Tunable van Hove Singularities and Correlated States in Twisted Monolayer-bilayer Graphene. Nature Physics. https://arxiv.org/abs/2004.12414

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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 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 monolayer-bilayer graphene (a bilayer on top of monolayer graphene heterostructure). We observed the formation of van Hove singularities which are highly tunable by changing either the twist angle or external electric field and can cause strong correlation effects under optimum conditions. We provide basic theoretical interpretations of the observed electronic structure. ",

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AU - Xu, Shuigang

AU - Ezzi, Mohammed M. Al

AU - Balakrishnan, Nilanthy

AU - Garcia-Ruiz, Aitor

AU - Tsim, Bonnie

AU - Mullan, Ciaran

AU - Barrier, Julien

AU - Xin, Na

AU - Piot, Benjamin A.

AU - Taniguchi, Takashi

AU - Katayama, Kenji

AU - Carvalho, Alexandra

AU - Mishchenko, Artem

AU - Geim, Andre

AU - Fal'ko, Vladimir

AU - Adam, Shaffique

AU - Neto, Antonio Helio Castro

AU - Novoselov, Konstantin

AU - Shi, Yanmeng

PY - 2021/1/8

Y1 - 2021/1/8

N2 - 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 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 monolayer-bilayer graphene (a bilayer on top of monolayer graphene heterostructure). We observed the formation of van Hove singularities which are highly tunable by changing either the twist angle or external electric field and can cause strong correlation effects under optimum conditions. We provide basic theoretical interpretations of the observed electronic structure.

AB - 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 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 monolayer-bilayer graphene (a bilayer on top of monolayer graphene heterostructure). We observed the formation of van Hove singularities which are highly tunable by changing either the twist angle or external electric field and can cause strong correlation effects under optimum conditions. We provide basic theoretical interpretations of the observed electronic structure.

M3 - Article

SN - 1745-2473

JO - Nature Physics

JF - Nature Physics

ER -

Tunable van Hove Singularities and Correlated States in Twisted Monolayer-bilayer Graphene

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