| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Coherent Acoustic Phonon and Its Chirping in Dirac Semimetal Cd$_{3}$As$_{2}$ |
| Fei Sun1,2†, M. Yang1,2†, M. W. Yang1,2, Q. Wu1,2, H. Zhao1,2, X. Ye1,2, Youguo Shi1,2, Jimin Zhao1,2** |
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190
2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049
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| Cite this article: |
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Fei Sun, M. Yang, M. W. Yang et al 2018 Chin. Phys. Lett. 35 116301 |
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Abstract Ultrafast optical spectroscopy of a single crystal of a Dirac semimetal Cd$_{3}$As$_{2}$ is carried out. An acoustic phonon (AP) mode with central frequency $f=0.037$ THz (i.e., 1.23 cm$^{-1}$ or 0.153 meV) is unambiguously generated and detected, which we attribute to laser-induced thermal strain. An AP chirping (i.e., variation of the phonon frequency) is clearly detected, which is ascribed to heat capacity variation with time. By comparing our experimental results and the theoretical model, we obtain a chirping time constant, which is 31.2 ps at 6 K and 19.8 ps at 300 K, respectively. Significantly, we identify an asymmetry in the AP frequency domain peak and find that it is caused by the chirping, instead of a Fano resonance. Moreover, we experimentally demonstrate that the central frequency of AP is extremely stable with varying laser fluence, as well as temperature, which endows Cd$_{3}$As$_{2}$ application potentials in thermoelectric devices.
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Received: 24 September 2018
Published: 23 October 2018
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| PACS: |
63.20.-e
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(Phonons in crystal lattices)
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78.47.D-
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(Time resolved spectroscopy (>1 psec))
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78.47.-p
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(Spectroscopy of solid state dynamics)
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71.55.Ak
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(Metals, semimetals, and alloys)
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| Fund: Supported by the National Key Research and Development Program of China under Grant Nos 2017YFA0303603, 2016YFA0300303, 2017YFA0302901 and 2016YFA0300604, the National Natural Science Foundation of China under Grant Nos 11774408, 11574383 and 11774399, the External Cooperation Program of Chinese Academy of Sciences under Grant No GJHZ1826, and the Interdisciplinary Innovation Team of Chinese Academy of Sciences. |
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