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 B62: Quantum Many Body Systems & Methods I
11:30 AM–2:18 PM,
Monday, March 6, 2023
Room: Room 417
Sponsoring
Unit:
DCOMP
Chair: Jack Wells, Nvidia
Abstract: B62.00008 : Spin and charge excitations across the phase diagram of the 2D Hubbard model.*
12:54 PM–1:06 PM
Presenter:
James LeBlanc
(Memorial Univ of Newfoundland)
Author:
James LeBlanc
(Memorial Univ of Newfoundland)
We study the weak coupling limit for finite next-nearest neighbour hopping where we resolve features in real frequency spectra that appear to be missed in numerical analytic continuation of Matsubara axis data. We track these features throughout the phase diagram and find that their existence has a simple explanation made clear when considering the $chi_{uparrowuparrow}$ and $chi_{uparrowdownarrow}$ susceptibilities. We further find that incompressibility in the model at weak coupling originates from vector nesting near the Lifshitz transition and present evidence that this may be distinct from Mott insulating behaviour.
*Natural Sciences and Engineering Research Council of Canada (NSERC) (RGPIN-2022-03882)
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