Speaker:  Dr. Liguo Ma, Cornell University

Host: Prof. Yang Xu, Nanoscale Physics and Devices Laboratory, Institute of Physics

Time: 10:00 am, November 22nd, 2022

Abstract:

Strong correlation is believed the driving force for unconventional high-temperature superconductivity (HTS). It could also suppress the density/phase fluctuation and stabilize high-temperature superfluid of another composite boson in solids, excitons. In this talk, I will present our efforts in understanding HTS in strongly correlated two-dimensional (2D) materials and hunting for high-temperature exciton superfluid in designed Van de Waals heterostructures. The former part is a short introduction to HTS in 2D crystals of a high-Tc cuprate compounds, Bi2Sr2CaCu2O8+x (Bi-2212), obtained by STM/STS. In the later part, I will share our recent progress in creating a strongly correlated excitonic insulator in TMDs double layers. Using quantum capacitance measurements, we obtained its thermal dynamic phase diagram that reveals both the Mott transition and interaction-stabilized quasi-condensation. I will also talk about my potential research interest of quantum many-boson states enabled by this excitonic system.

Brief CV of Dr. Liguo Ma:

Dr. Liguo Ma is currently a postdoc at Cornell University. He obtained his PhD in Condensed Matter Physics from Fudan University in 2019. His research has been focusing on strongly correlated phenomena and quantum condensation in low-dimensional materials.