Symmetry breaking and gap opening in two-dimensional hexagonal lattices

Details Symmetry breaking and gap opening in two-dimensional hexagonal lattices Symmetry breaking and gap opening in two-dimensional hexagonal lattices

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011njph...13a3026m&link_type=abstract

New Journal of Physics, Volume 13, Issue 1, pp. 013026 (2011).

Physics

1

Scientific paper

The inhibition in wave propagation at band gap energies plays a central role in many areas of technology such as electronics (electron gaps), nanophotonics (light gaps) and phononics (acoustic gaps), among others. Here we demonstrate that metal surfaces featuring free-electron-like bands may become semiconducting by periodic nanostructuration. We combine scanning tunneling spectroscopy and angle-resolved photoemisssion to accurately determine the energy-dependent local density of states and band structure of the Ag/Cu(111) noble metal interface patterned with an array of triangular dislocations, demonstrating the existence of a 25 meV band gap that extends over the entire surface Brillouin zone. We prove that this gap is a general consequence of symmetry reduction in close-packed metallic overlayers; in particular, we show that the gap opening is due to the symmetry lowering of the wave vector group at the K point from C3v to C3.

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