Photo-induced optical anisotropy and coherent oscillations in a quasi-two-dimensional two-orbital model for LaMnO₃

Room temperature optical anisotropy of a LaMnO3 thin-film induced by ultra-short pulse laser

“…4 In addition to the anisotropy, an oscillating signal is observed as a result of coherent phonon oscillation. 15,16 The inset of Fig. 3 shows the Fourier transformations of the data after subtracting the exponentially changing background.…”

“…Details of the model and calculation can be found in a previous study. 16 Effects of multiple reflections at the interfaces are ignored to simplify the calculations. The energy relaxation from system to environment is not considered in the model; therefore the exponential decay can not be found in the simulated data.…”

“…The data also show oscillations caused by interference between the quantum states. 16 The inset of Fig. 4(b) shows the Fourier transform result.…”

“…The strong peak around 15 THz was due to the Jahn-Teller Q 2 phonon mode, and the weak peak around 35 THz was due to the phonon-orbiton coupled excitation. 16 Other phonon modes observed in the experimental data are not considered in the calculation.…”