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Multiphoton k -resolved photoemission from gold surface states with 800-nm femtosecond laser pulses

Abstract : We measure direct multiphoton photoemission of the Au(111) surface state with 800-nm laser pulses. We observe the parabolic dispersion in the angular distribution of photoelectrons having absorbed between four and seven photons. The k dispersion we measure can be explained in terms of Shockley-state replicas, with a nascent hot electrons distribution at k above the Fermi level. Moderate laser power densities, of the order of 100 GW/cm 2 , resulted in large electron yields, indicating the importance of multiphoton excitations to define the electronic and magnetic properties of matter in the first hundred femtoseconds after laser excitation.
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Fausto Sirotti, Nathan Beaulieu, Azzedine Bendounan, Mathieu G. Silly, Christian Chauvet, et al.. Multiphoton k -resolved photoemission from gold surface states with 800-nm femtosecond laser pulses. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2014, 90 (3), pp.35401 - 35401. ⟨10.1103/PhysRevB.90.035401⟩. ⟨hal-01381241⟩

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