Photoinduced charge density wave phase in 1T-TaS$_2$: growth and coarsening mechanisms

Amélie Jarnac; Vincent L. R. Jacques; Laurent Cario; Etienne Janod; Steven L. Johnson; Sylvain Ravy; Claire Laulhé

doi:10.5802/crphys.89

Photoinduced charge density wave phase in 1T-TaS

_{2}

: growth and coarsening mechanisms
[Onde de densité de charge photoinduite dans 1T-TaS

_{2}

: mécanismes de croissance et de mûrissement]

Amélie Jarnac ¹ ; Vincent L. R. Jacques ² ; Laurent Cario ³ ; Etienne Janod ³ ; Steven L. Johnson ⁴ ; Sylvain Ravy ² ; Claire Laulhé ¹

¹ Université Paris-Saclay, Synchrotron Soleil, 91190, Saint-Aubin, France
² Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405, Orsay, France
³ Institut des Matériaux Jean Rouxel, Université de Nantes, CNRS, 2 rue de la Houssinière, 44322 Nantes Cedex 03, France
⁴ Institute for Quantum Electronics, Eidgenossische Technishe Hochschule (ETH) Zürich, 8093 Zürich, Switzerland

Comptes Rendus. Physique, Physics of ultra-fast phenomena, Volume 22 (2021) no. S2, pp. 139-160.

Résumé
Abstract

Plusieurs expériences récentes ont montré que les impulsions laser dans les domaines optique ou proche infrarouge permettent de déclencher des transitions entre états à onde de densité de charge (ODC) dans 1T-TaS $_{2}$ . Nous nous intéressons ici à la transition entre l’état à ODC presque commensurable (NC) et l’état à ODC incommensurable (I), habituellement observé au-dessus de 350 K. Lors de cette transition, plusieurs régions présentant les modulations de l’état I se forment et se développent. Lorsque la coalescence a lieu, ces régions se muent en domaines de la phase I photoinduite de 1T-TaS $_{2}$ , caractérisés chacun par un phasage particulier de l’ODC I. La phase I ainsi fragmentée en domaines subit alors une dynamique de mûrissement, c’est-à-dire une augmentation progressive de la taille de domaine ou encore de la longueur de corrélation de l’ODC I. En utilisant la diffraction des rayons X résolue en temps, nous montrons que le vecteur d’onde de l’ODC I photoinduite est plus court que dans l’ODC I observée à l’équilibre thermodynamique. Celui-ci s’allonge progressivement vers sa valeur d’équilibre, en même temps que la longueur de corrélation de l’ODC I augmente. Nous attribuons ce comportement à un autodopage de l’ODC I photoinduite, dû à la présence d’électrons piégés au voisinage de dislocations de l’ODC I. En réalisant une synthèse des résultats des différentes expériences menées jusqu’à présent, nous développons un scénario dans lequel les dislocations de l’ODC I sont créées au moment de la coalescence.

Recent experiments have shown that the high-temperature incommensurate (I) charge density wave (CDW) phase of 1T-TaS $_{2}$ can be photoinduced from the lower-temperature, nearly commensurate CDW state. In a first step, several independent regions exhibiting I-CDW phase modulations nucleate and grow. After coalescence, these regions form a multidomain I-CDW phase that undergoes coarsening dynamics, i.e. a progressive increase of the domain size or I-CDW correlation length. Using time-resolved X-ray diffraction, we show that the wave vector of the photoinduced I-CDW phase is shorter than in the I-CDW phase at equilibrium, and progressively increases towards its equilibrium value as the correlation length increases. We interpret this behaviour as a consequence of a self-doping of the photoinduced I-CDW, following the presence of trapped electrons in the vicinity of CDW dislocation sites. Putting together results of the present and past experiments, we develop a scenario in which the I-CDW dislocations are created during the coalescence of the I-CDW phase regions.

Première publication : 2021-10-12
Publié le : 2021-12-03

DOI : 10.5802/crphys.89

Keywords: Photoinduced phase transitions, Pump–probe X-ray diffraction, Charge density wave compounds, Topological defects, Transition metal dichalcogenides
Mots-clés : Transitions de phase photoinduites, Diffraction pompe–sonde des rayons X, Composés à onde de densité de charge, Défauts topologiques, Dichalcogénures de métaux de transition

Affiliations des auteurs :

Amélie Jarnac ¹ ; Vincent L. R. Jacques ² ; Laurent Cario ³ ; Etienne Janod ³ ; Steven L. Johnson ⁴ ; Sylvain Ravy ² ; Claire Laulhé ¹

¹ Université Paris-Saclay, Synchrotron Soleil, 91190, Saint-Aubin, France
² Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405, Orsay, France
³ Institut des Matériaux Jean Rouxel, Université de Nantes, CNRS, 2 rue de la Houssinière, 44322 Nantes Cedex 03, France
⁴ Institute for Quantum Electronics, Eidgenossische Technishe Hochschule (ETH) Zürich, 8093 Zürich, Switzerland

Licence :

CC-BY 4.0

Droits d'auteur : Les auteurs conservent leurs droits

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     author = {Am\'elie Jarnac and Vincent L.~R. Jacques and Laurent Cario and Etienne Janod and Steven L. Johnson and Sylvain Ravy and Claire Laulh\'e},
     title = {Photoinduced charge density wave phase in {1T-TaS}$_2$: growth and coarsening mechanisms},
     journal = {Comptes Rendus. Physique},
     pages = {139--160},
     publisher = {Acad\'emie des sciences, Paris},
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     year = {2021},
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Amélie Jarnac; Vincent L. R. Jacques; Laurent Cario; Etienne Janod; Steven L. Johnson; Sylvain Ravy; Claire Laulhé. Photoinduced charge density wave phase in 1T-TaS$_2$: growth and coarsening mechanisms. Comptes Rendus. Physique, Physics of ultra-fast phenomena, Volume 22 (2021) no. S2, pp. 139-160. doi : 10.5802/crphys.89. https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.89/

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