Light-Enhanced Spin Fluctuations and d-Wave Superconductivity at a Phase Boundary

Yao Wang; Cheng-Chien Chen; B. Moritz; T. P. Devereaux

doi:10.1103/PhysRevLett.120.246402

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Light-Enhanced Spin Fluctuations and d-Wave Superconductivity at a Phase Boundary

Yao Wang, Cheng-Chien Chen, B. Moritz, T. P. Devereaux

DOI 10.1103/PhysRevLett.120.246402 · Physical Review Letters

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Abstract

Time-domain techniques have shown the potential of photomanipulating existing orders and inducing new states of matter in strongly correlated materials. Using time-resolved exact diagonalization, we perform numerical studies of pump dynamics in a Mott-Peierls system with competing charge and spin density waves. A light-enhanced d-wave superconductivity is observed when the system resides near a quantum phase boundary. By examining the evolution of spin, charge, and superconducting susceptibilities, we show that a subdominant state in equilibrium can be stabilized by photomanipulating the charge order to allow superconductivity to appear and dominate. This work provides an interpretation of light-induced superconductivity from the perspective of order competition and offers a promising approach for designing novel emergent states out of equilibrium.