Understanding Multiferroic Hexagonal Manganites by Static and Ultrafast Optical Spectroscopy

Figure 9

LuMnO₃ measured at 293 K. (a) Δ𝑅/𝑅 as a function of time delay. (b) Oscillation component after subtraction of the slowly varying response. (c) Fourier power spectrum of the data with frequency 3.61 THz. (d) Schematic of the coherently excited A₁ phonon mode [36]. Reprinted figure with permission from Lou et al. [36]. Copyright (2009) by the American Physical Society. (e) Δ𝑅/𝑅 at various temperatures. (f) Fourier transformed amplitudes of coherent optical phonon [37]. Figures were reproduced with permission from Jang et al. [37].

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