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Article Dans Une Revue Comptes Rendus. Physique Année : 2021

Photoinduced charge density wave phase in 1T-TaS 2 : growth and coarsening mechanisms

Vincent L R Jacques
Laurent Cario
Etienne Janod
Claire Laulhé
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Résumé

Recent experiments have shown that the high-temperature incommensurate (I) charge density wave (CDW) phase of 1T-TaS2 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.

Dates et versions

hal-03525758 , version 1 (07-07-2022)

Identifiants

Citer

Amélie Jarnac, Vincent L R Jacques, Laurent Cario, Etienne Janod, Steven L Johnson, et al.. Photoinduced charge density wave phase in 1T-TaS 2 : growth and coarsening mechanisms. Comptes Rendus. Physique, 2021, 22 (S2), pp.139-160. ⟨10.5802/crphys.89⟩. ⟨hal-03525758⟩
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