Observation of ultrafast amorphization dynamics in GeCu2Te3thin films using echelon-based single-shot transient absorbance spectroscopy

Yusuke Arashida; Takayuki Suzuki; Shuhei Nara; Ikufumi Katayama; Yasuo Minami; Satoshi Shindo; Yuji Sutou; Toshiharu Saiki; Jun Takeda

doi:10.1063/5.0052872

Observation of ultrafast amorphization dynamics in GeCu₂Te₃thin films using echelon-based single-shot transient absorbance spectroscopy

Yusuke Arashida, Takayuki Suzuki, Shuhei Nara, Ikufumi Katayama, Yasuo Minami, Satoshi Shindo, Yuji Sutou, Toshiharu Saiki, Jun Takeda

ENG - Materials Science

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

2 Citations (Scopus)

Abstract

The compound GeCu2Te3 (GCT) has attracted considerable attention because of its several advantages for next-generation nonvolatile memories, including its higher thermal stability and lower volume change, with large optical contrast between the crystalline and amorphous phases. In this study, we demonstrate the ultrafast amorphization dynamics that occur in GCT by utilizing echelon-based single-shot transient absorbance spectroscopy and coherent phonon spectroscopy. We find that the timescale of the absorbance change accompanying amorphization is ∼2 ps, which is close to the dephasing time of the A1 optical phonons. Based on the observed results and the robust structural network of crystalline GCT, we discuss the amorphization dynamics in GCT by comparing it with that in the typical phase-change material Ge2Sb2Te5.

Original language	English
Article number	061102
Journal	Applied Physics Letters
Volume	119
Issue number	6
DOIs	https://doi.org/10.1063/5.0052872
Publication status	Published - 2021 Aug 9

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title = "Observation of ultrafast amorphization dynamics in GeCu2Te3thin films using echelon-based single-shot transient absorbance spectroscopy",

abstract = "The compound GeCu2Te3 (GCT) has attracted considerable attention because of its several advantages for next-generation nonvolatile memories, including its higher thermal stability and lower volume change, with large optical contrast between the crystalline and amorphous phases. In this study, we demonstrate the ultrafast amorphization dynamics that occur in GCT by utilizing echelon-based single-shot transient absorbance spectroscopy and coherent phonon spectroscopy. We find that the timescale of the absorbance change accompanying amorphization is ∼2 ps, which is close to the dephasing time of the A1 optical phonons. Based on the observed results and the robust structural network of crystalline GCT, we discuss the amorphization dynamics in GCT by comparing it with that in the typical phase-change material Ge2Sb2Te5.",

author = "Yusuke Arashida and Takayuki Suzuki and Shuhei Nara and Ikufumi Katayama and Yasuo Minami and Satoshi Shindo and Yuji Sutou and Toshiharu Saiki and Jun Takeda",

note = "Funding Information: This work was supported in part by the Grants-in-Aid for Scientific Research (KAKENHI, Grant Nos. 18H04288, 18H02053, and 20H05662) from the Japan Society for the Promotion of Science (JSPS) and by the JSPS Bilateral Program (No. 120209911). Publisher Copyright: {\textcopyright} 2021 Author(s).",

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doi = "10.1063/5.0052872",

language = "English",

volume = "119",

journal = "Applied Physics Letters",

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T1 - Observation of ultrafast amorphization dynamics in GeCu2Te3thin films using echelon-based single-shot transient absorbance spectroscopy

AU - Arashida, Yusuke

AU - Suzuki, Takayuki

AU - Nara, Shuhei

AU - Katayama, Ikufumi

AU - Minami, Yasuo

AU - Shindo, Satoshi

AU - Sutou, Yuji

AU - Saiki, Toshiharu

AU - Takeda, Jun

N1 - Funding Information: This work was supported in part by the Grants-in-Aid for Scientific Research (KAKENHI, Grant Nos. 18H04288, 18H02053, and 20H05662) from the Japan Society for the Promotion of Science (JSPS) and by the JSPS Bilateral Program (No. 120209911). Publisher Copyright: © 2021 Author(s).

PY - 2021/8/9

Y1 - 2021/8/9

N2 - The compound GeCu2Te3 (GCT) has attracted considerable attention because of its several advantages for next-generation nonvolatile memories, including its higher thermal stability and lower volume change, with large optical contrast between the crystalline and amorphous phases. In this study, we demonstrate the ultrafast amorphization dynamics that occur in GCT by utilizing echelon-based single-shot transient absorbance spectroscopy and coherent phonon spectroscopy. We find that the timescale of the absorbance change accompanying amorphization is ∼2 ps, which is close to the dephasing time of the A1 optical phonons. Based on the observed results and the robust structural network of crystalline GCT, we discuss the amorphization dynamics in GCT by comparing it with that in the typical phase-change material Ge2Sb2Te5.

AB - The compound GeCu2Te3 (GCT) has attracted considerable attention because of its several advantages for next-generation nonvolatile memories, including its higher thermal stability and lower volume change, with large optical contrast between the crystalline and amorphous phases. In this study, we demonstrate the ultrafast amorphization dynamics that occur in GCT by utilizing echelon-based single-shot transient absorbance spectroscopy and coherent phonon spectroscopy. We find that the timescale of the absorbance change accompanying amorphization is ∼2 ps, which is close to the dephasing time of the A1 optical phonons. Based on the observed results and the robust structural network of crystalline GCT, we discuss the amorphization dynamics in GCT by comparing it with that in the typical phase-change material Ge2Sb2Te5.

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JF - Applied Physics Letters

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Observation of ultrafast amorphization dynamics in GeCu₂Te₃thin films using echelon-based single-shot transient absorbance spectroscopy

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