Probing superconductivity in twisted bilayer graphene

When two graphene lattices are overlapped, they create a moiré pattern with a long superlattice period. At a twist angle around 1.1⁰ also known as magic angle the twisted bilayer graphene stack becomes superconducting.[1] By tuning the carrier density, the twisted bilayer graphene stack becomes an insulator.[2,3] These properties are similar to those of cuprates and other high-temperature superconductors. In this poster, we explain our efforts in fabrication of twisted bilayer graphene devices.

[1] Cao, Y.; Fatemi, V.; Fang, S.; Watanabe, K.; Taniguchi, T.; Kaxiras, E.; Jarillo-Herrero, P. Nature 2018, 556 (7699), 43–50
[2] Cao, Y.; Fatemi, V.; Demir, A.; Fang, S.; Tomarken, S. L.; Luo, J. Y.; Sanchez-Yamagishi, J. D.; Watanabe, K.; Taniguchi, T.; Kaxiras, E.; Ashoori, R. C.; Jarillo-Herrero, P. Nature 2018, 556 (7699), 80–84
[3] Lu, X.; Stepanov, P.; Yang, W.; Xie, M.; Aamir, M. A.; Das, I.; Urgell, C.; Watanabe, K.; Taniguchi, T.; Zhang, G.; Bachtold, A.; MacDonald, A. H.; Efetov, D. K. Nature 2019, 574 (7780), 653–657