Speaker
Giacomo Coslovich
(Lawrence Berkeley National Lab)
Description
G. Coslovich(1), B. Huber(1), W.-S. Lee(2), Y.-D. Chuang(3), Y. Zhu(1), T. Sasagawa(4), Z. Hussain(3), H. A. Bechtel(3), M. C. Martin(3), R. W. Schoenlein(1), Z.-X. Shen(2), and R. A. Kaindl(1)
(1) Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
(2) SIMES, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, CA 94025, USA
(3) Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
(4) Materials and Structures Laboratory, Tokyo Institute of Technology, Kanagawa 226-8503, Japan
Here we report the first ultrafast mid-infrared study of charge and spin-ordered nickelates. A strong photo-induced modulation of the optical conductivity is observed on sub-picosecond timescales, indicating the filling and subsequent re-establishment of the pseudogap in the time-domain. The fast timescale of this process (about 600 fs) suggests a major role of short-range correlations of polaronic carriers. Spectral analysis at energies resonant to the Ni-O stretching mode allows decoupling the phonon dynamics from the large pseudogap modulation. This approach reveals the interplay between specific lattice modes and the electronic degrees of freedom in nickelates.
Primary author
Giacomo Coslovich
(Lawrence Berkeley National Lab)
