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Solution to sign problems in models of interacting fermions and quantum spins

Journal Article · · Physical Review E
 [1];  [2]
  1. Duke Univ., Durham, NC (United States). Dept. of Physics; DOE/OSTI
  2. Duke Univ., Durham, NC (United States). Dept. of Physics; Indian Inst. of Science, Bangalore (India). Center for High Energy Physics
We show that solutions to fermion sign problems that are found in the formulation where the path integral is expanded in powers of the interaction in continuous time can be extended to systems involving fermions interacting with dynamical quantum spins. While these sign problems seem unsolvable in the auxiliary field approach, solutions emerge in the world-line representation of quantum spins. Combining this idea with meron-cluster methods, we are able to further extend the class of models that are solvable. We demonstrate these solutions to sign problems by considering several examples of strongly correlated systems that contain the physics of semimetals, insulators, superfluidity, and antiferromagnetism.
Research Organization:
Duke Univ., Durham, NC (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
FG02-05ER41368
OSTI ID:
1536400
Alternate ID(s):
OSTI ID: 1329344
Journal Information:
Physical Review E, Journal Name: Physical Review E Journal Issue: 4 Vol. 94; ISSN 2470-0045
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Phase space methods for Majorana fermions journal May 2018
Alleviating the sign problem in quantum Monte Carlo simulations of spin-orbit-coupled multiorbital Hubbard models journal January 2020

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