Experimental Quantum Seminar - Chenhao Jin (Cornell University) “Probing moiré superlattices with optical spectroscopy”

Event time: 
Thursday, February 20, 2020 - 11:00am to 12:00pm
Sloane Physics Laboratory (SPL), Room 59 See map
217 Prospect Street
New Haven, CT 06511
Event description: 

“Probing moiré superlattices with optical spectroscopy”
The moiré superlattices formed between two-dimensional (2D) materials provide new opportunities to engineer novel quantum phenomena. The most striking phenomena emerge in the “flat band” regime, where the periodic moiré potential dominates over the relevant kinetic energy and qualitatively changes the quasiparticle behaviors. Optical spectroscopy is a powerful tool to explore these new systems. In this talk, I will show the emergence of moiré excitons, i.e. bosons composed of tightly-bound electron-hole pairs, in semiconducting WSe2/WS2 superlattices in the “flat band” regime. The strong moiré potential traps excitons into a periodic boson lattice in the real space, exhibiting exotic behaviors. I will also discuss our efforts to optically detect strongly correlated electron phases in this platform.
Host: Bonnie Fleming