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Fluctuating Nature of Light-Enhancedd-Wave Superconductivity: A Time-Dependent Variational Non-Gaussian Exact Diagonalization Study
Physical Review X  (IF15.762),  Pub Date : 2021-11-09, DOI: 10.1103/physrevx.11.041028
Yao Wang, Tao Shi, Cheng-Chien Chen

Engineering quantum phases using light is a novel route to designing functional materials, where light-induced superconductivity is a successful example. Although this phenomenon has been realized experimentally, especially for the high-${T}_{c}$ cuprates, the underlying mechanism remains mysterious. Using the recently developed variational non-Gaussian exact diagonalization method, we investigate a particular type of photoenhanced superconductivity by suppressing a competing charge order in a strongly correlated electron-electron and electron-phonon system. We find that the $d$-wave superconductivity pairing correlation can be enhanced by a pulsed laser, consistent with recent experiments based on gap characterizations. However, we also find that the pairing correlation length is heavily suppressed by the pump pulse, indicating that light-enhanced superconductivity may be of fluctuating nature. Our findings also imply a general behavior of nonequilibrium states with competing orders, beyond the description of a mean-field framework.