Mapping the nonequilibrium order parameter of a quasi-two dimensional charge density wave system

C. J. Sayers; Y. Zhang; C. E. Sanders; R. T. Chapman; A. S. Wyatt; G. Chatterjee; E. Springate; Giulio Cerullo; Daniel Wolverson; Enrico Da Como; Ettore Carpene

doi:10.1038/s42005-024-01879-0

Mapping the nonequilibrium order parameter of a quasi-two dimensional charge density wave system

C. J. Sayers, Y. Zhang, C. E. Sanders, R. T. Chapman, A. S. Wyatt, G. Chatterjee, E. Springate, Giulio Cerullo, Daniel Wolverson, Enrico Da Como, Ettore Carpene

Research output: Contribution to journal › Article › peer-review

Abstract

The driving force of a charge-density wave (CDW) transition in quasi-two dimensional systems is still debated, while being crucial in understanding electronic correlation in such materials. Here we use femtosecond time- and angle-resolved photoemission spectroscopy combined with computational methods to investigate the coherent lattice dynamics of a prototypical CDW system. The photo-induced temporal evolution of the periodic lattice distortion associated with the amplitude mode reveals the dynamics of the free energy functional governing the order parameter. Our approach establishes that optically-induced screening rather than CDW melting at the electronic level leads to a transiently modified potential which explains the anharmonic behaviour of the amplitude mode and discloses the structural origin of the symmetry-breaking phase transition.

Original language	English
Article number	389
Journal	Communications Physics
Volume	7
Issue number	1
Early online date	28 Nov 2024
DOIs	https://doi.org/10.1038/s42005-024-01879-0
Publication status	Published - 28 Nov 2024

Data Availability Statement

All data related to this paper are available from the corresponding authors upon reasonable request.

Funding

We acknowledge financial support by the Italian Ministry of University and Research (grant PRIN 2017BZPKSZ), LaserLab-Europe (grant agreement no. 871124, European Union\u2019s Horizon 2020 research and innovation programme) and the European Union\u2019s NextGenerationEU Programme with the I-PHOQS Infrastructure [IR0000016, ID D2B8D520, CUP B53C22001750006] \u201CIntegrated infrastructure initiative in Photonic and Quantum Sciences\u201D. Access to Artemis at the Central Laser Facility was provided by STFC (experiment no. 20120002) with technical support from Alistair Cox, Phil Rice and Ota Michalek. Computational work was also supported by the University of Bath Cloud Pilot Project and the EU Horizon 2020 OCRE project \u201CCloud funding for research\u201D. Habib Rostami is gratefully acknowledged for fruitful discussions. We thank Aaron M. Ross for providing the transient reflectivity data\u00A0in the Supplementary. We acknowledge financial support by the Italian Ministry of University and Research (grant PRIN 2017BZPKSZ), LaserLab-Europe (grant agreement no. 871124, European Union\u2019s Horizon 2020 research and innovation programme) and the European Union\u2019s NextGenerationEU Programme with the I-PHOQS Infrastructure [IR0000016, ID D2B8D520, CUP B53C22001750006] \u201CIntegrated infrastructure initiative in Photonic and Quantum Sciences\u201D. Access to Artemis at the Central Laser Facility was provided by STFC (experiment no. 20120002) with technical support from Alistair Cox, Phil Rice and Ota Michalek. Computational work was also supported by the University of Bath Cloud Pilot Project and the EU Horizon 2020 OCRE project \u201CCloud funding for research\u201D. Habib Rostami is gratefully acknowledged for fruitful discussions. We thank Aaron M. Ross for providing the transient reflectivity data in the Supplementary.

Funders	Funder number
Horizon 2020 Framework Programme
Ministero dell’Istruzione, dell’Università e della Ricerca	PRIN 2017BZPKSZ, 871124
Science and Technology Facilities Council	20120002
European Commission	CUP B53C22001750006, IR0000016, D2B8D520

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Cite this

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abstract = "The driving force of a charge-density wave (CDW) transition in quasi-two dimensional systems is still debated, while being crucial in understanding electronic correlation in such materials. Here we use femtosecond time- and angle-resolved photoemission spectroscopy combined with computational methods to investigate the coherent lattice dynamics of a prototypical CDW system. The photo-induced temporal evolution of the periodic lattice distortion associated with the amplitude mode reveals the dynamics of the free energy functional governing the order parameter. Our approach establishes that optically-induced screening rather than CDW melting at the electronic level leads to a transiently modified potential which explains the anharmonic behaviour of the amplitude mode and discloses the structural origin of the symmetry-breaking phase transition.",

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Mapping the nonequilibrium order parameter of a quasi-two dimensional charge density wave system

Abstract

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Mapping the nonequilibrium order parameter of a quasi-two dimensional charge density wave system

Abstract

Data Availability Statement

Funding

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Cloud funding for Research

Cite this