Correlation-induced superconductivity dynamically stabilized and enhanced by laser irradiation

Abstract

Studies on out-of-equilibrium dynamics have paved a way to realize a new state of matter. Especially, superconductor-like properties above room temperatures recently suggested in copper oxides achieved by selectively exciting vibrational phonon modes by laser have inspired studies on an alternative and general strategy to be pursued for high temperature superconductivity. Here, we show that the superconductivity can be enhanced by irradiating laser to correlated electron systems owing to two mechanisms: First, the effective attractive interaction of carriers is enhanced by the dynamical localization mechanism, which drives the system into strong coupling regions. Secondly, the irradiation allows reaching uniform and enhanced superconductivity dynamically stabilized without deteriorating into equilibrium inhomogeneities that suppress superconductivity. The dynamical superconductivity is subject to the Higgs oscillations during and after the irradiation. Our finding shed light on a way to enhance superconductivity that is inaccessible in equilibrium in strongly correlated electron systems.

23 pages, 13 figures

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Cited by in corpus (31)

• Photoinduced $\eta$ Pairing in the Hubbard Model
• mVMC - Open-source software for many-variable variational Monte Carlo method
• Competition among various charge-inhomogeneous states and d-wave superconducting state in Hubbard models on square lattices
• Stripe and superconducting order competing in the Hubbard model on a square lattice studied by a combined variational Monte Carlo and tensor network method
• Theoretical Understanding of Photon Spectroscopies in Correlated Materials In and Out of Equilibrium
• Entropy-cooled nonequilibrium states of the Hubbard model
• Enhanced pairing susceptibility in a photo-doped two-orbital Hubbard model
• Transient Floquet engineering of superconductivity
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