Solution to sign problems in models of interacting fermions and quantum spins
Journal Article
·
· Physical Review E
- Duke Univ., Durham, NC (United States). Dept. of Physics; DOE/OSTI
- 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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