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Tuning superconductivity in twisted bilayer graphene

2019; American Association for the Advancement of Science; Volume: 363; Issue: 6431 Linguagem: Inglês

10.1126/science.aav1910

1095-9203

Matthew Yankowitz, Shaowen Chen, Hryhoriy Polshyn, Yuxuan Zhang, Kenji Watanabe, Takashi Taniguchi, David Graf, Andrea F. Young, Cory R. Dean,

Physics of Superconductivity and Magnetism

Upping the pressure in bilayer graphene The discovery of superconductivity and exotic insulating phases in twisted bilayer graphene has established this material as a model system of strongly correlated electrons. To achieve superconductivity, the two layers of graphene need to be at a very precise angle with respect to each other. Yankowitz et al. now show that another experimental knob, hydrostatic pressure, can be used to tune the phase diagram of twisted bilayer graphene (see the Perspective by Feldman). Applying pressure increased the coupling between the layers, which shifted the superconducting transition to higher angles and somewhat higher temperatures. Science , this issue p. 1059 ; see also p. 1035