Details

Autor(en) / Beteiligte

• Mizukoshi, Yu
• Fukuda, Takumi
• Komori, Yuta
• Ishikawa, Ryo
• Ueno, Keiji
• Hase, Muneaki

Titel

Ultrafast melting of charge-density wave fluctuations at room temperature in 1T-TiSe2 monitored under non-equilibrium conditions

Ist Teil von

• Applied physics letters, 2023-06, Vol.122 (24)

Ort / Verlag

Melville: American Institute of Physics

Erscheinungsjahr

2023

Link zum Volltext

Quelle

AIP Journals Complete

Beschreibungen/Notizen

• We investigate the ultrafast lattice dynamics in 1T-TiSe2 using femtosecond reflection pump–probe and pump–pump–probe techniques at room temperature. The time-domain signals and Fourier-transformed spectra show the A 1 g phonon mode at 5.9 THz. Moreover, we observe an additional mode at ≈ 3 THz, corresponding to the charge-density wave (CDW) amplitude mode (AM), which is generally visible below T c ≈ 200 K. We argue that the emergence of the CDW amplitude mode at room temperature can be a consequence of fluctuations of order parameters based on the additional experiment using the pump–pump–probe technique, which exhibited suppression of the AM signal within the ultrafast timescale of ∼0.5 ps.