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

被引：2

作者：

Mizukoshi, Yu ^{[1
]}

Fukuda, Takumi ^{[1
]}

Komori, Yuta ^{[1
]}

Ishikawa, Ryo ^{[2
]}

Ueno, Keiji ^{[2
]}

Hase, Muneaki ^{[1
]}

机构：

[1] Univ Tsukuba, Grad Sch Pure & Appl Sci, Dept Appl Phys, 1-1-1 Tennodai, Tsukuba 3058573, Japan

[2] Saitama Univ, Grad Sch Sci & Engn, Saitama 3388570, Japan

来源：

APPLIED PHYSICS LETTERS | 2023年 / 122卷 / 24期

关键词：

SYMMETRY-BREAKING; RAMAN; DYNAMICS; PHASE; INVERSION; PHONON; ORDER;

D O I：

10.1063/5.0153161

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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(1g) phonon mode at 5.9 THz. Moreover, we observe an additional mode at approximate to 3 THz, corresponding to the charge-density wave (CDW) amplitude mode (AM), which is generally visible below T-c approximate to 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 similar to 0.5 ps.

引用

页数：6

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