Journal
PHYSICAL REVIEW B
Volume 99, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.99.174516
Keywords
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Funding
- NSF at Stanford [DMR-1608055]
- Scientific Discovery through Advanced Computing (SciDAC) program - U.S. Department of Energy, Office of Science, Advanced Scientific Computing Research and Basic Energy Sciences, Division of Materials Sciences and Engineering
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Thermodynamic properties of the square-lattice Holstein model of the electron-phonon problem with phonon frequencies small compared to the bare Fermi energy are obtained using Monte Carlo methods, a strong-coupling (bipolaronic) expansion, and a weak-coupling Migdal-Eliashberg approach. Already at elevated temperatures where the charge-density wave (CDW) and superconducting (SC) correlations are very short range, a crossover occurs as a function of increasing electron-phonon coupling, lambda(0), from a normal metallic regime to a pseudogap regime. At sufficiently low T, a SC phase is found for small lambda(0) and a commensurate insulating CDW phase for large lambda(0).
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