Phys. Rev. B 80, 155130 (2009) [6 pages]Surface polaron formation in the Holstein modelReceived 11 May 2009; revised 2 October 2009; published 23 October 2009 The effect of a solid-vacuum interface on the properties of a strongly coupled electron-phonon system is analyzed using dynamical mean-field theory to solve the Holstein model in a semi-infinite cubic lattice. Polaron formation is found to occur more easily, i.e., for a weaker electron-phonon coupling, on the surface than in the bulk. On the other hand, the metal-insulator transition associated with the binding of polarons takes place at a unique critical strength in the bulk and at the surface. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.80.155130
DOI:
10.1103/PhysRevB.80.155130
PACS:
71.30.+h, 73.20.−r, 71.38.Ht
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