Analysis of coherent phonon signals by sparsity-promoting dynamic mode decomposition

Shin Murata, Shingo Aihara, Satoru Tokuda, Kazunori Iwamitsu, Kohji Mizoguchi, Ichiro Akai, Masato Okada

研究成果: Contribution to journalArticle査読

3 被引用数 (Scopus)


We propose a method to decompose normal modes in a coherent phonon (CP) signal by sparsity-promoting dynamic mode decomposition. While the CP signals can be modeled as the sum of finite number of damped oscillators, the conventional method such as Fourier transform adopts continuous bases in a frequency domain. Thus, the uncertainty of frequency appears and it is difficult to estimate the initial phase. Moreover, measurement artifacts are imposed on the CP signal and deforms the Fourier spectrum. In contrast, the proposed method can separate the signal from the artifact precisely and can successfully estimate physical properties of the normal modes.

ジャーナルjournal of the physical society of japan
出版ステータス出版済み - 2018

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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