Structural involvement in the melting of the charge density wave in $1\mathrm{T}\text{\ensuremath{-}}{\mathrm{TiSe}}_{2}$

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Structural involvement in the melting of the charge density wave in $1 T − {TiSe}_{2}$

Max Burian, Michael Porer, Jose R. L. Mardegan, Vincent Esposito, Sergii Parchenko, Bulat Burganov, Namrata Gurung, Mahesh Ramakrishnan, Valerio Scagnoli, Hiroki Ueda, Sonia Francoual, Federica Fabrizi, Yoshikazu Tanaka, Tadashi Togashi, Yuya Kubota, Makina Yabashi, Kai Rossnagel, Steven L. Johnson, and Urs Staub

Phys. Rev. Research 3, 013128 – Published 10 February 2021

Abstract

In this work, we use ultrafast pump-probe nonresonant and resonant x-ray diffraction to track the periodic lattice distortion and the electronic charge density wave in $1 T − {TiSe}_{2}$ upon optical excitation. We observe a fluence regime in which the periodic lattice deformation is strongly suppressed but the charge density wave related Se $4 p$ orbital order remains mostly intact. Complete melting of both structural and electronic order occurs four to five times faster than expected from a purely electronic charge-screening process, strongly suggesting a structurally assisted weakening of excitonic correlations. Our experimental data provide insight on the intricate coupling between structural and electronic order in stabilizing the periodic-lattice-distortion/charge-density-wave state in $1 T − {TiSe}_{2}$ . The results further show that electron-phonon coupling can lead to different, energy dependent phase-transition pathways in condensed matter systems, opening different possibilities in the conception of nonequilibrium phenomena at the ultrafast scale.

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Received 25 June 2020
Accepted 15 January 2021
Corrected 25 February 2021

DOI:https://doi.org/10.1103/PhysRevResearch.3.013128

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Charge density waves Dynamical phase transitions Excitons Lattice dynamics

Transition metal dichalcogenides

Resonant elastic x-ray scattering X-ray diffraction

Condensed Matter, Materials & Applied Physics

Corrections

25 February 2021

Correction: The omission of a support statement in the Acknowledgment section has been fixed.

Authors & Affiliations

Max Burian ^1,*, Michael Porer^1,*, Jose R. L. Mardegan^1,†, Vincent Esposito^1,‡, Sergii Parchenko^1,§, Bulat Burganov², Namrata Gurung ^3,4, Mahesh Ramakrishnan ¹, Valerio Scagnoli^3,4, Hiroki Ueda ¹, Sonia Francoual ⁵, Federica Fabrizi⁶, Yoshikazu Tanaka⁷, Tadashi Togashi^7,8, Yuya Kubota^7,8, Makina Yabashi^7,8, Kai Rossnagel ^9,10, Steven L. Johnson^2,11, and Urs Staub ^1,∥

¹Swiss Light Source, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
²Institute for Quantum Electronics, ETH Zürich, Auguste-Piccard-Hof 1, 8093 Zürich, Switzerland
³Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093 Zürich, Switzerland
⁴Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
⁵Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
⁶Diamond Light Source Ltd., Didcot, Oxfordshire OX11 0DE, United Kingdom
⁷RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
⁸Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
⁹Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany
¹⁰Ruprecht-Haensel-Labor, Deutsches Elektronen-Synchrotron DESY, D-22607 Hamburg, Germany
¹¹SwissFEL, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland

^*These authors contributed equally to this work.
^†Present address: Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany.
^‡Present address: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025.
^§Present address: Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093 Zürich, Switzerland.
^∥Author to whom correspondence should be addressed: urs.staub@psi.ch

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Vol. 3, Iss. 1 — February - April 2021

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Physical Review Research

Structural involvement in the melting of the charge density wave in 1T−TiSe2

Phys. Rev. Research 3, 013128 – Published 10 February 2021

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Structural involvement in the melting of the charge density wave in $1 T − {TiSe}_{2}$