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 A21: Flatbands without Moire
8:00 AM–11:00 AM,
Monday, March 6, 2023
Room: Room 213
Sponsoring
Unit:
DCMP
Chair: Sayed Ali Akbar Ghorashi, Stonybrook University
Abstract: A21.00006 : Coulomb Interactions and Renormalization of Anisotropic Flat 2D Bands*
9:00 AM–9:12 AM
Presenter:
Valeri N Kotov
(University of Vermont)
Author:
Valeri N Kotov
(University of Vermont)
We find that at low energy there is a very strong, double logarithmic renormalization of the dispersion in the flat direction, which can be treated by renormalization group techniques. This results in an extraordinary renormalization of the electronic spectrum, with restored quasi-linear behavior in momentum in both directions at low energies (up to log corrections).
Thus we conclude that Coulomb interactions tend to restore the band dispersion and the interpretation of experimental data at low temperatures has to take into account the strong Coulomb interaction effects which for flat anisotropic Dirac bands are much more pronounced compared to linear Dirac semimetals (such as graphene).
*We acknowledge financial support from NASA grant number 80NSSC19M0143
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