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Coherent excitation of phonon polaritons in BaGa4Se7 by terahertz pulses

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Phonon polaritons are generated in BaGa4Se7 by linear excitation of terahertz pulses, and probed using 800 nm femtosecond laser pulses. The observed phonon polaritons can be perfectly reproduced by a damped harmonic oscillator model.

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