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Updated: Feb 27, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
Published on: December 3, 2013
Nonlinear Electron-Phonon Coupling in Doped Manganites
V Esposito1, M Fechner2,3, R Mankowsky2,4
1Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.
Abstract:
We employ time-resolved resonant x-ray diffraction to study the melting of charge order and the associated insulator-to-metal transition in the doped manganite Pr_{0.5}Ca_{0.5}MnO_{3} after resonant excitation of a high-frequency infrared-active lattice mode. We find that the charge order reduces promptly and highly nonlinearly as function of excitation fluence. Density-functional theory calculations suggest that direct anharmonic coupling between the excited lattice mode and the electronic structure drives these dynamics, highlighting a new avenue of nonlinear phonon control.
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