Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session D25: Ultrafast Dynamics and Control of Quantum Materials
3:00 PM–6:00 PM,
Monday, March 6, 2023
Room: Room 217/218
Sponsoring
Unit:
DLS
Chair: Robert Kaindl, Arizona State University
Abstract: D25.00010 : Discovery and Characterization of a Novel Lattice Instability in SnSe*
5:12 PM–5:24 PM
Presenter:
Yijing Huang
(Stanford University)
Authors:
Yijing Huang
(Stanford University)
Shan Yang
(Duke University)
Samuel W Teitelbaum
(ASU)
Gilberto De La Pena
(SLAC - Natl Accelerator Lab)
Takahiro Sato
(SLAC)
Matthieu Chollet
(slac)
Diling Zhu
(SLAC - Natl Accelerator Lab)
Jennifer Niedziela
(Oak Ridge National Lab)
Dipanshu Bansal
(Indian Inst of Tech-Bombay)
Andrew F May
(Oak Ridge National Lab)
Aaron M Lindenberg
(Stanford Univ)
Olivier Delaire
(Duke University)
David A Reis
(Stanford Univ)
Mariano Trigo
(SLAC - Natl Accelerator Lab)
structures. They host a number of structural phases that are sensitive to external parameters (e.g., temperature, pressure, and chemical doping) and are expected to exhibit tunability by
the light field. The large polarizability in resonantly bonded materials means pronounced coupling between phonons and electronic states, which yields large responses of the X-ray
probe.
We show that using a combination of ultrafast optical and X-ray lasers, we can understand materials on the natural time and length scales of their chemical bonding, which is not achievable with purely optical probes. The knowledge of the microscopic interactions in the non-equilibrium states will ultimately help us explore possible new functionalities in the non-equilibrium phases.
In particular, we use time-resolved X-ray diffraction to obtain amplitude as well as the phase of atomic motion, which allows us to reconstruct the lattice structure of SnSe. The structural distortions and the related new phase are unexpected, and cannot be correctly concluded from a purely optical (e.g., Raman scattering) measurement. We also use time-resolved X-ray diffuse scattering to access the excitedstate dispersion of SnSe, which elucidates how photoexcitation alters the strength of specific bonds leading to this the novel lattice instability observed in diffraction.
* Funded by US Department of Energy, Office of Science, Office of Basic Energy Sciences through the Division of Materials Sciences and Engineering under Contract No. DE-AC02- 76SF00515.
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