Work

Spectroscopic signatures of mode-selective electron-phonon coupling in transient reflectivity change on charge-density-wave TiSe$_2$

Year: 2026

Type: preprint

Abstract: We report on time- and spectrally resolved pump-probe spectroscopy measurement on the charge-density wave (CDW) state of TiSe$_2$ at helium temperatures. The non-oscillatory component of the spectrally resolved signals exhibit a sign reversal near 1.5 eV, which was interpreted as a redshift of the optical transition energy originated from the interband transition between the Se $p$-based valence band to the Ti $d$-derived conduction band. Furthermore, the oscillatory components exhibit distinct spectral dependences between the optical phonons and the CDW-derived modes, suggesting the mode-selective coupling.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2609.10348

Authors: Mizukoshi, Yu, Hase, Muneaki

Institution: University of Tsukuba

Language: English

Topic: 2D Materials and Applications

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funders: Daegu Gyeongbuk Institute of Science and Technology, Japan Society for the Promotion of Science

Awards: G1386331666, Investigation of the nonlinear electrical transport in low-dimensional conductors under the ultrafast photoexcitation, G55425687, G981901169

OpenAlex ID: W7212146470

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