ESPCI web site
Thursday October 12 at 2:00 pm (Paris time)
ESPCI, Room Boreau, building C, 2nd floor
Discovering emergent correlated states and quantum phase transitions in a moiré superlattice
New phase of matter usually emerges when a given symmetry breaks spontaneously, which can involve charge, spin, and valley degree of freedoms. By twisting graphene multilayer to form a moiré superlattice, it leads to moiré flat band where various correlated states are developed. In this talk, I will focus on the twisted double bilayer graphene, and talk about the field-tunable exotic phases such as isospin polarized correlated insulators, anomalous quantum oscillations (QOs) of insulating states, and first-order quantum phase transitions where interplays among correlation, isospin polarization, and Landau quantization are important.
Biography
Dr. Wei Yang received his Ph.D in condensed matter physics from Institute of Physics, Chinese Academy of Sciences in 2014. He worked as a postdoc from 2014 to 2019, first at École Normale Supérieure and CNRS in Paris, and then at ICOF-The Institute of Photonic Sciences in Barcelona. Then, he joined Institute of Physics CAS as a faculty member since 2019. His research interest lies in exploring the novel phenomena emerging from low dimensional system including carbon nanotube, graphene and moiré superlattices, by quantum transport, high frequency noise thermometry, and nano-mechanics.
