# Watching the birth of a charge density wave order: diffraction study on nanometer-and picosecond-scales

Source: [Watching the birth of a charge density wave order: diffraction study on nanometer-and picosecond-scales](<https://www.sota2.com/research/paper/68fa35d81e209131ce8a50f7>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T21:29:46.381Z

Authors: C. Laulh\\'e, T. Huber, G. Lantz, A. Ferrer, S.O. Mariager, S. Gr\\"ubel, J. Rittmann, J.A. Johnson, V. Esposito, A. L\\"ubcke, L. Huber, M. Kubli, M. Savoini, V.L.R. Jacques, L. Cario, B. Corraze, E. Janod, G. Ingold, P. Beaud, S.L. Johnson, S. Ravy

Published: 2017-03-21T23:14:06.000Z

## Abstract

Femtosecond time-resolved X-ray diffraction is used to study a photo-induced phase transition between two charge density wave (CDW) states in 1T-TaS$\_2$, namely the nearly commensurate (NC) and the incommensurate (I) CDW states. Structural modulations associated with the NC-CDW order are found to disappear within 400 fs. The photo-induced I-CDW phase then develops through a nucleation/growth process which ends 100 ps after laser excitation. We demonstrate that the newly formed I-CDW phase is fragmented into several nanometric domains that are growing through a coarsening process. The coarsening dynamics is found to follow the universal Lifshitz-Allen-Cahn growth law, which describes the ordering kinetics in systems exhibiting a non-conservative order parameter.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1703.07465>)

[PDF](<https://arxiv.org/pdf/1703.07465.pdf>)