Dynamics of electronic states in the insulating intermediate surface phase of $1\mathrm{T}\text{\ensuremath{-}}{\mathrm{TaS}}_{2}$

Dynamics of electronic states in the insulating intermediate surface phase of $1 T − {TaS}_{2}$

Jingwei Dong, Weiyan Qi, Dongbin Shin, Laurent Cario, Zhesheng Chen, Romain Grasset, Davide Boschetto, Mateusz Weis, Pierrick Lample, Ernest Pastor, Tobias Ritschel, Marino Marsi, Amina Taleb, Noejung Park, Angel Rubio, Evangelos Papalazarou, and Luca Perfetti

Phys. Rev. B 108, 155145 – Published 26 October 2023

Abstract

This article reports a comparative study of bulk and surface properties in the transition metal dichalcogenide $1 T − {TaS}_{2}$ . When heating the sample, the surface displays an intermediate insulating phase that persists for $\sim 10$ K on top of a metallic bulk. The weaker screening of Coulomb repulsion and a stiffer charge density wave (CDW) explain such resilience of a correlated insulator in the topmost layers. Both time-resolved angle-resolved photoelectron spectroscopy and transient reflectivity are employed to investigate the dynamics of electrons and CDW collective motion. It follows that the amplitude mode is always stiffer at the surface and displays variable coupling to the Mott-Peierls band, stronger in the low-temperature phase and weaker in the intermediate one.

Received 22 July 2023
Revised 18 September 2023
Accepted 9 October 2023

DOI:https://doi.org/10.1103/PhysRevB.108.155145

Physics Subject Headings (PhySH)

Charge density waves

2-dimensional systems Transition metal dichalcogenides

Time & angle resolved photoemission spectroscopy Time-resolved reflection spectroscopy

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jingwei Dong¹, Weiyan Qi¹, Dongbin Shin ^2,3, Laurent Cario⁴, Zhesheng Chen⁵, Romain Grasset¹, Davide Boschetto⁶, Mateusz Weis ^6,7, Pierrick Lample^6,7, Ernest Pastor⁸, Tobias Ritschel⁹, Marino Marsi⁵, Amina Taleb¹⁰, Noejung Park¹¹, Angel Rubio³, Evangelos Papalazarou⁵, and Luca Perfetti¹

¹Laboratoire des Solides Irradiés, CEA/DRF/lRAMIS, Ecole Polytechnique, CNRS, Institut Polytechnique de Paris, F-91128 Palaiseau, France
²Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea
³Max Planck Institute for the Structure and Dynamics of Matter and Center for Free-Electron Laser Science, Luruper Chaussee 149, 22761 Hamburg, Germany
⁴Nantes Université, CNRS, Institut des Matériaux de Nantes Jean Rouxel, IMN, F-44000 Nantes, France
⁵Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405 Orsay Cedex, France
⁶LOA, Laboratoire d'Optique Appliquée, CNRS, Ecole Polytechnique, ENSTA Paris, Institut Polytechnique de Paris, 181 Chemin de la Hunière et des Joncherettes, 91120 Palaiseau, France
⁷Université Paris-Saclay, CEA, CNRS, LIDYL, Gif-sur-Yvette, 91191, France
⁸IPR - Institut de Physique de Rennes, CNRS - Centre national de la recherche scientifique, UMR 6251 Université de Rennes, 35000 Rennes, France
⁹Instut für Festkörper- und Materialphysik, Technische Universität Dresden, 01069, Dresden, Germany
¹⁰Synchrotron SOLEIL, Saint Aubin BP 48, Gif-sur-Yvette F-91192, France
¹¹Department of Physics, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, Korea

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Vol. 108, Iss. 15 — 15 October 2023

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Physical Review B

covering condensed matter and materials physics

Dynamics of electronic states in the insulating intermediate surface phase of $1 T − {TaS}_{2}$

Jingwei Dong, Weiyan Qi, Dongbin Shin, Laurent Cario, Zhesheng Chen, Romain Grasset, Davide Boschetto, Mateusz Weis, Pierrick Lample, Ernest Pastor, Tobias Ritschel, Marino Marsi, Amina Taleb, Noejung Park, Angel Rubio, Evangelos Papalazarou, and Luca Perfetti

Phys. Rev. B 108, 155145 – Published 26 October 2023

Abstract

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Physical Review B

covering condensed matter and materials physics

Dynamics of electronic states in the insulating intermediate surface phase of 1T−TaS2

Jingwei Dong, Weiyan Qi, Dongbin Shin, Laurent Cario, Zhesheng Chen, Romain Grasset, Davide Boschetto, Mateusz Weis, Pierrick Lample, Ernest Pastor, Tobias Ritschel, Marino Marsi, Amina Taleb, Noejung Park, Angel Rubio, Evangelos Papalazarou, and Luca Perfetti

Phys. Rev. B 108, 155145 – Published 26 October 2023

Abstract

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Dynamics of electronic states in the insulating intermediate surface phase of $1 T − {TaS}_{2}$