Ultrafast x-ray scattering reveals composite amplitude collective mode in the Weyl charge density wave material (TaSe\(_4\))\(_2\)I

Ultrafast x-ray scattering reveals composite amplitude collective mode in the Weyl charge density wave material (TaSe\(_4\))\(_2\)I

We report ultrafast x-ray scattering experiments of the quasi-1D charge density wave (CDW) material (TaSe\(_4\))\(_2\)I following photoexcitation with femtosecond infrared laser pulses. From the time-dependent diffraction signal at the CDW sidebands we identify an amplitude mode derived primarily fr...

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Veröffentlicht in:arXiv.org 2022-12
Hauptverfasser: Nguyen, Quynh L, Duncan, Ryan A, Orenstein, Gal, Huang, Yijing, Krapivin, Viktor, de la Pena, Gilberto, Ornelas-Skarin, Chance, Reis, David A, Abbamonte, Peter, Bettler, Simon, Chollet, Matthieu, Hoffmann, Matthias C, Hurley, Matthew, Kim, Soyeun, Kirchmann, Patrick S, Kubota, Yuya, Mahmood, Fahad, Miller, Alexander, Osaka, Taito, Qu, Kejian, Sato, Takahiro, Shoemaker, Daniel P, Sirica, Nicholas, Song, Sanghoon, Stanton, Jade, Teitelbaum, Samuel W, Tilton, Sean E, Togashi, Tadashi, Zhu, Diling, Trigo, Mariano
Format: Artikel
Sprache:eng
Schlagworte:
Acoustic waves
Acoustics
Amplitudes
Charge density waves
Charge materials
Displacement
Femtosecond pulses
Free electron lasers
Infrared lasers
Photoexcitation
Sidebands
Tantalum
Terahertz frequencies
X-ray scattering
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Zusammenfassung:We report ultrafast x-ray scattering experiments of the quasi-1D charge density wave (CDW) material (TaSe\(_4\))\(_2\)I following photoexcitation with femtosecond infrared laser pulses. From the time-dependent diffraction signal at the CDW sidebands we identify an amplitude mode derived primarily from the transverse acoustic component of the CDW static distortion. The dynamics of this acoustic amplitude mode are described well by a model of a displacive excitation, which we interpret as mediated through a coupling to the optical phonon component associated with the tetramerization of the Ta chains.
ISSN:2331-8422