Physics - Condensed Matter Seminar

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Yihang Zeng, Cornell University

Condensed Matter Seminar - "Strong correlation physics in TMD moiré materials"

Event Type
Seminar/Symposium
Sponsor
Physics - Condensed Matter
Location
ESB 190
Date
Feb 24, 2023   1:00 pm  
Speaker
Yihang Zeng, Cornell University
Contact
Stephen Bullwinkel
E-Mail
bullwink@illinois.edu
Phone
217-333-1652
Views
327

Understanding strongly correlated quantum phenomena is a major ongoing challenge in condensed matter physics. This endeavor is hindered by difficulty in solving quantum many-body theories and the complexity of real materials. Two-dimensional moiré materials with remarkable tunability and flexibility stands out as a paradigmatic system for the simulation and investigation of strong correlation physics problems. In this talk, I will first introduce our recently developed technique where thermodynamic equation of states is detected using optical sensing. Applying this technique to a transition metal dichalcogenide (TMD) moiré system that realizes the Kane-Mele Hubbard model, we found an excitonic Chern insulator after a correlation driven topological phase transition. I will also discuss our recent observation of exciton Wigner crystal and exciton density wave phase in Coulomb-coupled flat-band system.

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