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

Yao Wang: Cheng-Chien Chen, B. Moritz, and T. P. Devereaux; Physical Review Letters, 06/12/18.

Additional Authors: Cheng-Chien Chen, B. Moritz, and T. P. Devereaux

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 lightinduced superconductivity from the perspective of order competition and offers a promising approach for designing novel emergent states out of equilibrium.