Superconducting fluctuations and charge-4e plaquette state at strong coupling
Qiong Qin, Jian-Jun Dong, Yutao Sheng, Dongchen Huang, Yi-feng Yang
DOI 10.1103/PhysRevB.108.054506 · Physical Review B
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Abstract
We apply the static auxiliary field Monte Carlo approach to study phase correlations of the pairing fields in a model with spin-singlet pairing interaction. We find that the short- and long-distance phase correlations are well captured by the phase mutual information, which allows us to construct a theoretical phase diagram containing the uniform d-wave superconducting region, the phase fluctuating region, the local pairing region, and the disordered region. We show that the gradual development of phase coherence has a number of consequences on spectroscopic measurements, such as the development of the Fermi arc and the anisotropy in the angle-resolved spectra, scattering rate, entropy, specific heat, and quasiparticle dispersion, in good agreement with experimental observations. For strong coupling, our Monte Carlo simulation reveals an unexpected charge-4e plaquette state with d-wave bonds, which competes with the uniform d-wave superconductivity and exhibits a U-shaped density of states.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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