--- _id: '392' abstract: - lang: eng text: We used femtosecond optical pump-probe spectroscopy to study the photoinduced change in reflectivity of thin films of the electron-doped cuprate La2-xCexCuO4 (LCCO) with dopings of x=0.08 (underdoped) and x=0.11 (optimally doped). Above Tc, we observe fluence-dependent relaxation rates that begin at a temperature similar to the one where transport measurements first show signatures of antiferromagnetic correlations. Upon suppressing superconductivity with a magnetic field, it is found that the fluence and temperature dependence of relaxation rates are consistent with bimolecular recombination of electrons and holes across a gap (2ΔAF) originating from antiferromagnetic correlations which comprise the pseudogap in electron-doped cuprates. This can be used to learn about coupling between electrons and high-energy (ω>2ΔAF) excitations in these compounds and set limits on the time scales on which antiferromagnetic correlations are static. acknowledgement: Optical pump-probe work was supported by the Gordon and Betty Moore Foundation's EPiQS initiative through Grant No. GBMF4540. Materials growth and characterization was supported by AFOSR FA95501410332 and NSF DMR1410665. author: - first_name: Inna full_name: Vishik, Inna last_name: Vishik - first_name: Fahad full_name: Mahmood, Fahad last_name: Mahmood - first_name: Zhanybek full_name: Alpichshev, Zhanybek id: 45E67A2A-F248-11E8-B48F-1D18A9856A87 last_name: Alpichshev orcid: 0000-0002-7183-5203 - first_name: Nuh full_name: Gedik, Nuh last_name: Gedik - first_name: Joshu full_name: Higgins, Joshu last_name: Higgins - first_name: Richard full_name: Greene, Richard last_name: Greene citation: ama: Vishik I, Mahmood F, Alpichshev Z, Gedik N, Higgins J, Greene R. Ultrafast dynamics in the presence of antiferromagnetic correlations in electron doped cuprate La2 xCexCuO4±δ. Physical Review B. 2017;95(11). doi:10.1103/PhysRevB.95.115125 apa: Vishik, I., Mahmood, F., Alpichshev, Z., Gedik, N., Higgins, J., & Greene, R. (2017). Ultrafast dynamics in the presence of antiferromagnetic correlations in electron doped cuprate La2 xCexCuO4±δ. Physical Review B. American Physical Society. https://doi.org/10.1103/PhysRevB.95.115125 chicago: Vishik, Inna, Fahad Mahmood, Zhanybek Alpichshev, Nuh Gedik, Joshu Higgins, and Richard Greene. “Ultrafast Dynamics in the Presence of Antiferromagnetic Correlations in Electron Doped Cuprate La2 XCexCuO4±δ.” Physical Review B. American Physical Society, 2017. https://doi.org/10.1103/PhysRevB.95.115125. ieee: I. Vishik, F. Mahmood, Z. Alpichshev, N. Gedik, J. Higgins, and R. Greene, “Ultrafast dynamics in the presence of antiferromagnetic correlations in electron doped cuprate La2 xCexCuO4±δ,” Physical Review B, vol. 95, no. 11. American Physical Society, 2017. ista: Vishik I, Mahmood F, Alpichshev Z, Gedik N, Higgins J, Greene R. 2017. Ultrafast dynamics in the presence of antiferromagnetic correlations in electron doped cuprate La2 xCexCuO4±δ. Physical Review B. 95(11). mla: Vishik, Inna, et al. “Ultrafast Dynamics in the Presence of Antiferromagnetic Correlations in Electron Doped Cuprate La2 XCexCuO4±δ.” Physical Review B, vol. 95, no. 11, American Physical Society, 2017, doi:10.1103/PhysRevB.95.115125. short: I. Vishik, F. Mahmood, Z. Alpichshev, N. Gedik, J. Higgins, R. Greene, Physical Review B 95 (2017). date_created: 2018-12-11T11:46:13Z date_published: 2017-03-13T00:00:00Z date_updated: 2021-01-12T07:53:12Z day: '13' doi: 10.1103/PhysRevB.95.115125 extern: '1' intvolume: ' 95' issue: '11' language: - iso: eng main_file_link: - open_access: '1' url: http://dspace.mit.edu/handle/1721.1/109835 month: '03' oa: 1 oa_version: None publication: Physical Review B publication_status: published publisher: American Physical Society publist_id: '7437' status: public title: Ultrafast dynamics in the presence of antiferromagnetic correlations in electron doped cuprate La2 xCexCuO4±δ type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 95 year: '2017' ...