Work

Constraints from antiunitary symmetries on phase diagrams of sign problem free models

Year: 2025

Type: article

Abstract: A powerful way to guarantee the absence of a sign problem in determinantal quantum Monte Carlo simulations is imposing a particular type of antiunitary symmetries. It is shown that these same symmetries give rise to constraints on correlation functions, which can be used to identify local operators whose correlations upper bound those of a large class of physically relevant operators, including for example superconducting order parameters. Our results also help understand why it is difficult to realize generic finite-momentum orders in sign problem free models.

Source: Physical review. B./Physical review. B

DOI: 10.1103/pxsx-33qy

Authors: Xu Zhang, Nick Bultinck

Institution: Ghent University

Language: English

Topic: Quantum many-body systems

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Simons Foundation, European Commission, Science Foundation Ireland, H2020 European Research Council

Awards: G1498459968, G2239383600, G3887229302, G434337789