We propose an experimental technique to generate large amplitude coherent phonons with irradiation of THz-rate pump pulses and to study the dynamics of phase transition in GeTe ferroelectrics. When a single pump pulse irradiates the sample at various pump power densities, the frequency of the soft phonon decreases sublinearly and saturates at higher pump powers. By contrast, when the THz-rate pump pulse sequence irradiates the sample at matched time intervals to forcibly drive oscillation, a large redshift of the phonon frequency is observed without any saturation effects. After excitation with a four pump pulse sequence, the coherent soft phonon becomes strongly damped and leads to a near critical damping condition. This condition indicates that the lattice is driven to a precursor state of the phase transition.
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15 December 2003
Research Article|
December 15 2003
Forcibly driven coherent soft phonons in GeTe with intense THz-rate pump fields
Muneaki Hase;
Muneaki Hase
Materials Engineering Laboratory, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan
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Masahiro Kitajima;
Masahiro Kitajima
Materials Engineering Laboratory, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan
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Shin-ichi Nakashima;
Shin-ichi Nakashima
Power Electronic Research Center, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba 305-8561, Japan
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Kohji Mizoguchi
Kohji Mizoguchi
Department of Applied Physics, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
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Muneaki Hase
Masahiro Kitajima
Shin-ichi Nakashima
Kohji Mizoguchi
Materials Engineering Laboratory, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan
Appl. Phys. Lett. 83, 4921–4923 (2003)
Article history
Received:
June 09 2003
Accepted:
October 17 2003
Citation
Muneaki Hase, Masahiro Kitajima, Shin-ichi Nakashima, Kohji Mizoguchi; Forcibly driven coherent soft phonons in GeTe with intense THz-rate pump fields. Appl. Phys. Lett. 15 December 2003; 83 (24): 4921–4923. https://doi.org/10.1063/1.1633016
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