Phys. Rev. Lett. 94, 017401 (2005) [4 pages]Time-Resolved Two-Photon Photoemission of Buried Interface States in Ar/Cu(100)Received 24 September 2004; published 11 January 2005 We demonstrate the existence of buried image-potential states at the interface between thick Ar films and a Cu(100) substrate. The electron dynamics of these solid-solid interface states, energetically located above the vacuum level in the band gaps of both materials, could be investigated with time-resolved two-photon photoemission for an Ar layer thickness up to 200 Å. Relaxation on time scales between 40 and 200 fs occurs via two distinct channels, resonant tunneling through the insulating layer into the vacuum and electron-hole pair decay in the metal. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.017401
DOI:
10.1103/PhysRevLett.94.017401
PACS:
78.47.+p, 73.20.–r, 73.40.Ns, 79.60.–i
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