Ultrafast X-Ray Scattering Reveals Composite Amplitude Collective Mode in the Weyl Charge Density Wave Material (TaSe_{4})_{2}I

Quynh L Nguyen; Ryan A Duncan; Gal Orenstein; Yijing Huang; Viktor Krapivin; Gilberto de la Peña; Chance Ornelas-Skarin; David A Reis; Peter Abbamonte; Simon Bettler; Matthieu Chollet; Matthias C Hoffmann; Matthew Hurley; Soyeun Kim; Patrick S Kirchmann; Yuya Kubota; Fahad Mahmood; Alexander Miller; Taito Osaka; Kejian Qu; Takahiro Sato; Daniel P Shoemaker; Nicholas Sirica; Sanghoon Song; Jade Stanton; Samuel W Teitelbaum; Sean E Tilton; Tadashi Togashi; Diling Zhu; Mariano Trigo

doi:10.1103/PhysRevLett.131.076901

Ultrafast X-Ray Scattering Reveals Composite Amplitude Collective Mode in the Weyl Charge Density Wave Material (TaSe_{4})_{2}I

Phys Rev Lett. 2023 Aug 18;131(7):076901. doi: 10.1103/PhysRevLett.131.076901.

Authors

Quynh L Nguyen^{1

2}, Ryan A Duncan^{1

2}, Gal Orenstein^{1

2}, Yijing Huang^{1

2

3}, Viktor Krapivin^{1

2

3}, Gilberto de la Peña^{1

2}, Chance Ornelas-Skarin^{1

2

3}, David A Reis^{1

2

3

4}, Peter Abbamonte⁵, Simon Bettler^{5

6}, Matthieu Chollet⁷, Matthias C Hoffmann⁷, Matthew Hurley⁸, Soyeun Kim^{5

6}, Patrick S Kirchmann², Yuya Kubota⁹, Fahad Mahmood^{5

6}, Alexander Miller⁸, Taito Osaka⁹, Kejian Qu^{5

6}, Takahiro Sato⁷, Daniel P Shoemaker^{6

10}, Nicholas Sirica¹¹, Sanghoon Song⁷, Jade Stanton⁸, Samuel W Teitelbaum⁸, Sean E Tilton⁸, Tadashi Togashi^{9

12}, Diling Zhu⁷, Mariano Trigo^{1

2}

Affiliations

¹ Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
² Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
³ Department of Applied Physics, Stanford University, Stanford, California 94305, USA.
⁴ Department of Photon Science, Stanford University, Stanford, California 94305, USA.
⁵ Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
⁶ Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
⁷ Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
⁸ Department of Physics, Arizona State University, Tempe, Arizona 85281, USA.
⁹ RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan.
¹⁰ Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
¹¹ Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
¹² Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan.

PMID: 37656841
DOI: 10.1103/PhysRevLett.131.076901

Abstract

We report ultrafast x-ray scattering experiments of the quasi-1D charge density wave (CDW) material (TaSe_{4})_{2}I following ultrafast infrared photoexcitation. From the time-dependent diffraction signal at the CDW sidebands we identify a 0.11 THz amplitude mode derived primarily from a transverse acoustic mode of the high-symmetry structure. From our measurements we determine that this mode interacts with the valence charge indirectly through another collective mode, and that the CDW system in (TaSe_{4})_{2}I has a composite nature supporting multiple dynamically active structural degrees of freedom.