Theory of ultrafast quasiparticle dynamics in high-temperature superconductors : the dependence on pump fluence

• Main Authors: Prasankumar, Rohit P., Taylor, Antoinette J., Chia, Elbert E. M., Tao, Jianmin, Zhu, Jian-Xin
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2013
• Subjects: DRNTU::Science::Physics
• Online Access: https://hdl.handle.net/10356/95461; http://hdl.handle.net/10220/9304
• Institution: Nanyang Technological University

We present a theory for the time-resolved optical spectroscopy of high-temperature superconductors at high excitation densities with strongly anisotropic electron-phonon coupling. A signature of the strong coupling between the out-of-plane, out-of-phase O-buckling mode (B1g) and electronic states near the antinode is observed as a higher-energy peak in the time-resolved optical conductivity and Raman spectra, while no evidence of strong coupling between the in-plane Cu-O-breathing mode and nodal electronic states is observed. More interestingly, it is observed that under appropriate conditions of pump fluence, this signature exhibits a reentrant behavior with time delay, following the fate of the superconducting condensate.