We report on the dynamics of coherent phonons in semimetal 1T′- using femtosecond pump-probe spectroscopy. On an ultrafast sub-picosecond timescale at room temperature, a low frequency and long-lifetime shear phonon mode was observed at 0.39 THz, which was previously reported in the form of a characteristic phonon only in the low temperature phase. Unlike the other optical phonon modes, the shear phonon mode was found to strongly couple with photoexcited carriers. Moreover, the amplitude of the shear mode surprisingly decreased with increasing excitation density, a phenomenon that can be attributed to be a consequence of the lattice temperature increasing after excitation. These results provide useful physical information on ultrafast lattice symmetry switching between the normal semimetal 1T′ and the lattice inversion symmetry breaking Type-II Weyl semimetal phases.
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2 March 2020
Research Article|
March 05 2020
Ultrafast dynamics of the low frequency shear phonon in 1T′-
Takumi Fukuda
;
Takumi Fukuda
a)
1
Department of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba
, 1-1-1 Tennodai, Tsukuba 305-8573, Japan
a)Author to whom correspondence should be addressed: [email protected]
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Kotaro Makino
;
Kotaro Makino
2
Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Japan
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Yuta Saito
;
Yuta Saito
2
Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Japan
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Paul Fons
;
Paul Fons
2
Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Japan
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Alexander V. Kolobov
;
Alexander V. Kolobov
2
Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Japan
3
Department of Physical Electronics, Faculty of Physics, Herzen State Pedagogical University of Russia
, 48 Moika Embankment, St. Petersburg 191186, Russia
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Keiji Ueno
;
Keiji Ueno
4
Graduate School of Science and Engineering, Saitama University
, Saitama 338-8570, Japan
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Muneaki Hase
Muneaki Hase
b)
1
Department of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba
, 1-1-1 Tennodai, Tsukuba 305-8573, Japan
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Takumi Fukuda
1,a)
Kotaro Makino
2
Yuta Saito
2
Paul Fons
2
Alexander V. Kolobov
2,3
Keiji Ueno
4
Muneaki Hase
1,b)
1
Department of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba
, 1-1-1 Tennodai, Tsukuba 305-8573, Japan
2
Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Japan
3
Department of Physical Electronics, Faculty of Physics, Herzen State Pedagogical University of Russia
, 48 Moika Embankment, St. Petersburg 191186, Russia
4
Graduate School of Science and Engineering, Saitama University
, Saitama 338-8570, Japan
a)Author to whom correspondence should be addressed: [email protected]
Appl. Phys. Lett. 116, 093103 (2020)
Article history
Received:
December 24 2019
Accepted:
February 19 2020
Citation
Takumi Fukuda, Kotaro Makino, Yuta Saito, Paul Fons, Alexander V. Kolobov, Keiji Ueno, Muneaki Hase; Ultrafast dynamics of the low frequency shear phonon in 1T′-. Appl. Phys. Lett. 2 March 2020; 116 (9): 093103. https://doi.org/10.1063/1.5143485
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