Phys. Rev. Lett. 93, 216804 (2004) [4 pages]Breakup of Quasiparticles in Thin-Film Quantum WellsReceived 23 June 2004; published 18 November 2004 Quantum well states in thin films are commonly described in terms of a quasiparticle confined in a quantum box, but this single-particle picture can fail dramatically near a substrate band edge, as shown by this angle-resolved photoemission study. Atomically uniform Ag films are prepared on Ge(111) to facilitate accurate line shape and dispersion relation measurements. A quantum well peak is observed to split into two peaks near the Ge valence band edge. The unusual line shapes are shown to be due to many-body interactions and are quantitatively explained by a Green’s function calculation. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.216804
DOI:
10.1103/PhysRevLett.93.216804
PACS:
73.21.Fg, 68.65.Fg, 79.60.Dp
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