Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session D30: Strongly Correlated Systems, Including Quantum Fluids and Solids II
3:00 PM–5:48 PM,
Monday, March 6, 2023
Room: Room 222/223
Sponsoring
Unit:
DCMP
Chair: Eric Bauer, Los Alamos Natl Lab
Abstract: D30.00008 : Strongly correlated excitonic charge transfer insulators and selective Mott transition in twisted bilayers transition metal dichalcogenides (TMDs)
4:24 PM–4:36 PM
Presenter:
Lorenzo Del Re
(Max Planck Institute for Solid State Research)
Author:
Lorenzo Del Re
(Max Planck Institute for Solid State Research)
Collaboration:
Lorenzo Del Re
Here we present a study of the SU(4)-Hubbard model in the triangular lattice, that should capture the salient features of this material, using Dynamical Mean Field Theory (DMFT).
Our DMFT results show that strong correlations stabilizes an exitonic insulating phase via a selective Mott transition occurring in one of two effective orbitals.
Since the orbital unaffected by the Mott transition already lies below the Fermi level before and after the transition, the system's spectral function displays the typical feautres of a charge transfer insulator. Furthermore, our calculations show a strong enhancement of the local spin/valley susceptibility approaching the transition, in agreement with the experimental evidence of local moments formation.
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