Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session D08: Advances in Computational Techniques for Strongly Correlated Systems
3:00 PM–5:48 PM,
Monday, March 4, 2024
Room: L100I
Sponsoring
Unit:
DCMP
Chair: Philip Dee, University of Tennessee
Abstract: D08.00010 : Multiboson exchange embedding for the Hubbard model*
4:48 PM–5:00 PM
Presenter:
Dominik Kiese
(Flatiron Institute, Simons Foundation)
Authors:
Dominik Kiese
(Flatiron Institute, Simons Foundation)
Nils Wentzell
(Flatiron Institute, Simons Foundation)
Olivier P Parcollet
(Flatiron Institute, Simons Foundation)
Karsten Held
(TU Vienna)
Friedrich J Krien
(TU Vienna)
We present a novel quantum-embedding approach based on the single-boson exchange (SBE) decomposition of the parquet equations. In the SBE formalism, all diagrams contributing to the two-particle vertex F are grouped according to their interaction reducibility, i.e. the way in which they can be split into disconnected parts by removing a bare vertex. This way, unphysical divergences in two-particle irreducible quantities are efficiently mitigated and only the well-conditioned multiboson vertex M is needed to determine all other (single-boson and single-particle) functions self-consistently. Using the dynamical cluster approximation (DCA) with statistically exact CT-QMC simulations, we determine M for small Hubbard clusters coupled to a metallic environment and solve the self-consistent equations on periodic lattices with up to 24 x 24 sites, preserving the full frequency and momentum dependence of all single-boson exchange diagrams. We benchmark our approach against established many-body methods for the half-filled square lattice Hubbard model.
*The Flatiron Institute is a division of the Simons Foundation.
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700