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When twisted a relatively small orientation angle, bilayer graphene has superlattice minibands that have emerged as a rich and highly tunable source of quantum phases, notably the appearance of superconductivity close to interaction-induced insulating states and novel band topology. In this talk, I will discuss our recent transport study on twisted bilayer graphene (tBLG). We succeeded in observing a large variety of previously unobserved states, including a full sequence of correlated states with novel topological textures, new superconducting domes and orbital magnets in the first magic angle (~1.1°) tBLG. I will also discuss the multiple flat bands and underlying fragile topology we recently observed in tBLG near the second magic angle (~0.5°).
Reference
X. Lu et al, Nature 574, 653 (2019)
P. Stepanov et al, Nature 583, 375 (2020)
X. Lu et al, arXiv: 2006.13963 (2020)
I. Das et al, arXiv: 2007.13390 (2020)
Dr. Xiaobo Lu received his Ph.D degree in 2017 under the supervision of Prof. Guangyu Zhang at Institute of Physics, CAS. Before joining ETH Zurich as a postdoc, he has three-year postdoc experience at ICFO – The Institute of Photonic Sciences. His research interests focus on the quantum transport/photonics study of low dimensional quantum materials (graphene, TMD etc.).