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

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Article number054003
Journaljournal of the physical society of japan
Volume87
Issue number5
DOIs
Publication statusPublished - Jan 1 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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