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Snapshots of the retarded interaction of charge carriers with ultrafast fluctuations in cuprates

Dal Conte, S and Vidmar, L and Golež, D and Mierzejewski, M and Soavi, G and Peli, S and Banfi, F and Ferrini, G and Comin, R and Ludbrook, BM and Chauviere, L and Zhigadlo, ND and Eisaki, H and Greven, M and Lupi, S and Damascelli, A and Brida, D and Capone, M and Bonča, J and Cerullo, G and Giannetti, C (2015) Snapshots of the retarded interaction of charge carriers with ultrafast fluctuations in cuprates. Nature Physics, 11. pp. 421-426. ISSN 1745-2473

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One of the pivotal questions in the physics of high-temperature superconductors is whether the low-energy dynamics of the charge carriers is mediated by bosons with a characteristic timescale. This issue has remained elusive as electronic correlations are expected to greatly accelerate the electron-boson scattering processes, confining them to the very femtosecond timescale that is hard to access even with state-of-the-art ultrafast techniques. Here we simultaneously push the time resolution and frequency range of transient reflectivity measurements up to an unprecedented level, enabling us to directly observe the ∼16 fs build-up of the effective electron-boson interaction in hole-doped copper oxides. This extremely fast timescale is in agreement with numerical calculations based on the t-J model and the repulsive Hubbard model, in which the relaxation of the photo-excited charges is achieved via inelastic scattering with short-range antiferromagnetic excitations.

Item Type: Article
Divisions: Div B > Electronics, Power & Energy Conversion
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:29
Last Modified: 14 Jun 2018 01:57