Photoinduced Superconducting Gap and Pseudogap Dynamics in High-T_c Cuprates

Abstract

We present polarization and coherent quench analyses of the gap dynamics in Bi-based high-T_c cuprates (Bi2212) using femtosecond optical pump-probe spectroscopy. The polarization analysis has addressed the rotational symmetry breakings of the dynamics, which are suppressed at room temperature and appears below T^*. The coherent quench experiment of the pseudogap has indicated an absence of long-range electronic order beyond a few coherence lengths on short timescales.