Journal
PHYSICAL REVIEW LETTERS
Volume 125, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.167001
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Funding
- NSF [DMR2000987]
- National Science Fund for Distinguished Young Scholars of NSFC [11825404]
- Ministry of Science and Technology of China [2016YFA0301001, 2018YFA0305604]
- Gordon and Betty Moore Foundations EPiQS [GBMF4302]
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We analyze the quantum phase diagram of the Holstein-Hubbard model using an asymptotically exact strong coupling expansion. We find all sorts of interesting phases including a pair-density wave, a charge 4e (and even a charge 6e) superconductor, regimes of phase separation, and a variety of distinct charge-density-wave, spin-density-wave, and superconducting regimes. We chart the crossovers that occur as a function of the degree of retardation, i.e., the ratio of characteristic phonon frequency to the strength of interactions.
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