Multiphoton k -resolved photoemission from gold surface states with 800-nm femtosecond laser pulses
Résumé
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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Sirotti et al. - 2014 - Multiphoton span class=aps-inline-formulamath xmlns=httpwww.w3.org1998MathMathMLmikmimathspan-resolved photoemis.pdf (1.36 Mo)
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