Abstract
The anisotropic optical response of Si(111)-(4×1)/(8×2)-In in the mid-infrared, where significant changes in the band structure between competing models of this important quasi-1D system are expected, has been calculated from first principles. Two characteristic peaks are calculated for the hexagon model of the (8×2) structure, but not for the trimer model. The comparison with recent infrared reflection anisotropy spectroscopy (RAS) data—showing the replacement of the anisotropic Drude tail of the (4×1) phase by two peaks at 0.50 eV and 0.72 eV—gives strong evidence for the hexagon model. Our calculations thus settle decades of intense debate about the ground-state geometry of this important prototype for quasi one-dimensional electronic systems.
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Schmidt, W.G. et al. (2011). Si(111)-In Nanowire Optical Response from Large-scale Ab Initio Calculations. In: Nagel, W., Kröner, D., Resch, M. (eds) High Performance Computing in Science and Engineering '10. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-15748-6_11
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DOI: https://doi.org/10.1007/978-3-642-15748-6_11
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