Lu, Xiaobo

Date:   Thursday, November 14, 2019
Time:   15:15
Place:   ETH Zurich, Hönggerberg, HPF G 6
Host:    Ataç İmamoğlu

Emergent Quantum States in Flat-band Twisted Bilayer Graphene

Xiaobo Lu
ICFO – The Institute of Photonics Sciences, Spain

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). By reducing the twist angle disorder, we succeeded in observing a large variety of previously unobserved states, including all correlated states, new superconducting domes, orbital magnets and Chern insulating states in first magic angle (~1.1°) tBLG. I will also discuss the multiple relatively flat bands and evidence of fragile topology which we recently observed in tBLG near second magic angle (~0.5°).

References:
Y. Cao et al, Nature (2018) ×2
X. Lu et al, arXiv:1903.06513 (Nature in press)