Nematic electron and phonon dynamics in SnS crystals

Nguyen Nhat Quyen; Tz Ju Hong; Chin En Hsu; Wen Yen Tzeng; Chien Ming Tu; Chia Nung Kuo; Hung Chung Hsueh; Chin Shan Lue; Chih Wei Luo

doi:10.1063/5.0099486

Nematic electron and phonon dynamics in SnS crystals

Nguyen Nhat Quyen, Tz Ju Hong, Chin En Hsu, Wen Yen Tzeng, Chien Ming Tu, Chia Nung Kuo, Hung Chung Hsueh^*, Chin Shan Lue^*, Chih Wei Luo^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

Tin sulfide (SnS) is one of the promising materials for the applications of optoelectronics and photovoltaics. This study determines the nematic dynamics of photoexcited electrons and phonons in SnS single crystals using polarization-dependent pump-probe spectroscopy at various temperatures. As well as the fast (0.21-1.38 ps) and slow (>5 ps) relaxation processes, a 36-41 GHz coherent acoustic phonon with a sound velocity of 4883 m/s that is generated by the thermoelastic effect is also observed in the transient reflectivity change (ΔR/R) spectra. Electrons and coherent acoustic phonons show significant in-plane anisotropy from 330 to 430 K due to strong electron-phonon coupling. However, this in-plane anisotropy weakens dramatically in the low-temperature (<330 K) and high-temperature (>430 K) phases. These results add to the knowledge about the anisotropy of electrons and coherent acoustic phonons that give SnS applications in photovoltaic or optoelectronic devices.

Original language	English
Article number	172105
Journal	Applied Physics Letters
Volume	121
Issue number	17
DOIs	https://doi.org/10.1063/5.0099486
State	Published - 24 Oct 2022

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title = "Nematic electron and phonon dynamics in SnS crystals",

abstract = "Tin sulfide (SnS) is one of the promising materials for the applications of optoelectronics and photovoltaics. This study determines the nematic dynamics of photoexcited electrons and phonons in SnS single crystals using polarization-dependent pump-probe spectroscopy at various temperatures. As well as the fast (0.21-1.38 ps) and slow (>5 ps) relaxation processes, a 36-41 GHz coherent acoustic phonon with a sound velocity of 4883 m/s that is generated by the thermoelastic effect is also observed in the transient reflectivity change (ΔR/R) spectra. Electrons and coherent acoustic phonons show significant in-plane anisotropy from 330 to 430 K due to strong electron-phonon coupling. However, this in-plane anisotropy weakens dramatically in the low-temperature (<330 K) and high-temperature (>430 K) phases. These results add to the knowledge about the anisotropy of electrons and coherent acoustic phonons that give SnS applications in photovoltaic or optoelectronic devices.",

author = "Quyen, {Nguyen Nhat} and Hong, {Tz Ju} and Hsu, {Chin En} and Tzeng, {Wen Yen} and Tu, {Chien Ming} and Kuo, {Chia Nung} and Hsueh, {Hung Chung} and Lue, {Chin Shan} and Luo, {Chih Wei}",

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doi = "10.1063/5.0099486",

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T1 - Nematic electron and phonon dynamics in SnS crystals

AU - Quyen, Nguyen Nhat

AU - Hong, Tz Ju

AU - Hsu, Chin En

AU - Tzeng, Wen Yen

AU - Tu, Chien Ming

AU - Kuo, Chia Nung

AU - Hsueh, Hung Chung

AU - Lue, Chin Shan

AU - Luo, Chih Wei

PY - 2022/10/24

Y1 - 2022/10/24

N2 - Tin sulfide (SnS) is one of the promising materials for the applications of optoelectronics and photovoltaics. This study determines the nematic dynamics of photoexcited electrons and phonons in SnS single crystals using polarization-dependent pump-probe spectroscopy at various temperatures. As well as the fast (0.21-1.38 ps) and slow (>5 ps) relaxation processes, a 36-41 GHz coherent acoustic phonon with a sound velocity of 4883 m/s that is generated by the thermoelastic effect is also observed in the transient reflectivity change (ΔR/R) spectra. Electrons and coherent acoustic phonons show significant in-plane anisotropy from 330 to 430 K due to strong electron-phonon coupling. However, this in-plane anisotropy weakens dramatically in the low-temperature (<330 K) and high-temperature (>430 K) phases. These results add to the knowledge about the anisotropy of electrons and coherent acoustic phonons that give SnS applications in photovoltaic or optoelectronic devices.

AB - Tin sulfide (SnS) is one of the promising materials for the applications of optoelectronics and photovoltaics. This study determines the nematic dynamics of photoexcited electrons and phonons in SnS single crystals using polarization-dependent pump-probe spectroscopy at various temperatures. As well as the fast (0.21-1.38 ps) and slow (>5 ps) relaxation processes, a 36-41 GHz coherent acoustic phonon with a sound velocity of 4883 m/s that is generated by the thermoelastic effect is also observed in the transient reflectivity change (ΔR/R) spectra. Electrons and coherent acoustic phonons show significant in-plane anisotropy from 330 to 430 K due to strong electron-phonon coupling. However, this in-plane anisotropy weakens dramatically in the low-temperature (<330 K) and high-temperature (>430 K) phases. These results add to the knowledge about the anisotropy of electrons and coherent acoustic phonons that give SnS applications in photovoltaic or optoelectronic devices.

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DO - 10.1063/5.0099486

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VL - 121

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 17

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ER -

Nematic electron and phonon dynamics in SnS crystals

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