Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5395991 | Journal of Electron Spectroscopy and Related Phenomena | 2014 | 6 Pages |
Abstract
Time- and angle-resolved photoemission spectroscopy (trARPES) using femtosecond extreme ultraviolet high harmonics has recently emerged as a powerful tool for investigating ultrafast quasiparticle dynamics in correlated-electron materials. However, the full potential of this approach has not yet been achieved because, to date, high harmonics generated by 800Â nm wavelength Ti:Sapphire lasers required a trade-off between photon flux, energy and time resolution. Photoemission spectroscopy requires a quasi-monochromatic output, but dispersive optical elements that select a single harmonic can significantly reduce the photon flux and time resolution. Here we show that 400Â nm driven high harmonic extreme-ultraviolet trARPES is superior to using 800Â nm laser drivers since it eliminates the need for any spectral selection, thereby increasing photon flux and energy resolution to <150Â meV while preserving excellent time resolution of about 30Â fs.
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Authors
S. Eich, A. Stange, A.V. Carr, J. Urbancic, T. Popmintchev, M. Wiesenmayer, K. Jansen, A. Ruffing, S. Jakobs, T. Rohwer, S. Hellmann, C. Chen, P. Matyba, L. Kipp, K. Rossnagel, M. Bauer, M.M. Murnane, H.C. Kapteyn, M. Aeschlimann,