Journal
EPL
Volume 110, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1209/0295-5075/110/57001
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Funding
- Simons Collaboration on the Many Electron Problem, National Science Foundation [PHY-1314735]
- MURI Program New Quantum Phases of Matter from AFOSR
- Swiss National Science Foundation
- NSFC [11275185]
- CAS
- NKBRSFC [2011CB921300]
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For over half a century, the Hubbard model has played a paradigmatic role in attempts to understand quantum phenomena exhibited by correlated electrons in solids. Despite a substantial effort and the apparent simplicity of the model, its behavior in many important regimes has remained unknown. Here we study superfluidity in the two-dimensional Hubbard model with controlled error bars up to the coupling strength U = 4 and filling factor n = 0.7. We show, by means of unbiased diagrammatic Monte Carlo simulations, that in this regime the superfluid transition is governed by Fermi liquid physics with an emergent weak BCS-type coupling driving the instability. The corresponding ground-state phase diagram in the (n, U) plane describes the competition between the superfluid states of p- and d-wave symmetry. We also report dimensionless coupling constants in this effective BCS regime. Copyright (C) EPLA, 2015
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