Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session L10: DLS Focus Session
8:00 AM–11:00 AM,
Wednesday, March 17, 2021
Sponsoring
Unit:
DLS
Abstract: L10.00005 : Photoinduced phase switching in 1T’-TaTe2 visualized by relativistic ultrafast electron diffraction**
8:48 AM–9:00 AM
Live
Presenter:
Khalid Siddiqui
(Materials Sciences Division, Lawrence Berkeley National Laboratory)
Authors:
Khalid Siddiqui
(Materials Sciences Division, Lawrence Berkeley National Laboratory)
Daniel Brian Durham
(National Center for Electron Microscopy, Lawrence Berkeley National Laboratory)
Frederick Cropp
(Department of Physics and Astronomy, University of California, Los Angeles)
Sangeeta Rajpurohit
(Molecular Foundry, Lawrence Berkeley National Laboratory)
Colin Ophus
(Molecular Foundry, Lawrence Berkeley National Laboratory)
Yanglin Zhu
(Department of Physics, The Pennsylvania State University)
Johan D Carlström
(Molecular Foundry, Lawrence Berkeley National Laboratory)
Camille Stavrakas
(Molecular Foundry, Lawrence Berkeley National Laboratory)
Zhiqiang Mao
(Department of Physics, The Pennsylvania State University)
Archana Raja
(Molecular Foundry, Lawrence Berkeley National Laboratory)
Pietro Musumeci
(Department of Physics and Astronomy, University of California, Los Angeles)
Liang Tan
(Molecular Foundry, Lawrence Berkeley National Laboratory)
Andrew M Minor
(National Center for Electron Microscopy, Lawrence Berkeley National Laboratory)
Robert A Kaindl
(Department of Physics, Arizona State University)
Daniele Filippetto
(Accelerator Technology and Applied Physics Division, Lawrence Berkeley National Laboratory)
We investigated 1T’-TaTe2 - a member of the 2D TaX2 family with unique atomic ordering of Ta atoms including forming trimer superstructures below Tc ~ 170 K. We optically induced phase transition in 1T’-TaTe2 at 10 K and used the ultrafast electron diffraction facility at Lawrence Berkeley National Laboratory (HiRES [1]) to sensitively probe its structural response [2]. The system was found to switch on picosecond timescale between the trimer superstructure and the corresponding melted phase via a charge transfer mechanism according to density functional theory (DFT) calculations, opening up pathways to manipulate atomic order in this material.
In this contribution, we discuss the observed dynamics in light of dynamical diffraction simulations and DFT and provide an outlook for future studies of this intriguing system.
[1]. K. M. Siddiqui and D. B. Durham et al., arXiv:2009.02891 (2020).
[2]. F. Ji et al.,Commun Phys 2, 54, (2019).
**Work at LBNL was supported by the DOE Office of Basic Energy Sciences.
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