Phys. Rev. Lett. 102, 226805 (2009) [4 pages]Structure of Si(111)-In Nanowires Determined from the Midinfrared Optical ResponseReceived 3 March 2009; published 5 June 2009 The anisotropic optical response of Si(111)-(4×1)/(8×2)-In in the midinfrared, where ab initio studies predict significant changes in the band structure between competing models of this important quasi-1D system, has been measured using infrared spectroscopic ellipsometry (IRSE) and reflection anisotropy spectroscopy (RAS). Both IRSE and RAS of the (8×2) phase show that the anisotropic Drude tail of the (4×1) phase is replaced by two peaks at 0.50 and 0.72 eV, which appear in ab initio optical response calculations for the hexagon model of the (8×2) structure, but not the trimer model. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.226805
DOI:
10.1103/PhysRevLett.102.226805
PACS:
73.20.At, 78.68.+m
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