Density of states approach to the hexagonal Hubbard model at finite density

Koerner, Michael, Langfeld, Kurt ORCID: 0000-0002-4368-3580, Smith, Dominik and von Smekal, Lorenz (2020) Density of states approach to the hexagonal Hubbard model at finite density. PHYSICAL REVIEW D, 102 (5). 054502-.

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Official URL: http://dx.doi.org/10.1103/physrevd.102.054502

Abstract

We apply the linear logarithmic relaxation (LLR) method, which generalizes the Wang-Landau algorithm to quantum systems with continuous degrees of freedom, to the fermionic Hubbard model with repulsive interactions on the honeycomb lattice. We compute the generalized density of states of the average Hubbard field and devise two reconstruction schemes to extract physical observables from this result. By computing the particle density as a function of chemical potential we assess the utility of LLR in dealing with the sign problem of this model, which arises away from half filling. We show that the relative advantage over brute-force reweighting grows as the interaction strength is increased and discuss possible future improvements.

Item Type:	Article
Divisions:	Faculty of Science and Engineering > School of Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	09 Sep 2021 15:48
Last Modified:	17 Mar 2024 11:21
DOI:	10.1103/PhysRevD.102.054502
Open Access URL:	https://journals.aps.org/prd/abstract/10.1103/Phys...
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3136531