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Electronic Structure of Solids with Competing Periodic Potentials

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Science  20 Oct 2000:
Vol. 290, Issue 5491, pp. 501-503
DOI: 10.1126/science.290.5491.501

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Abstract

When electrons are subject to a potential with two incommensurate periods, translational invariance is lost, and no periodic band structure is expected. However, model calculations based on nearly free one-dimensional electrons and experimental results from high-resolution photoemission spectroscopy on a quasi–one-dimensional material do show dispersing band states with signatures of both periodicities. Apparent band structures are generated by the nonuniform distribution of electronic spectral weight over the complex eigenvalue spectrum.

  • * To whom correspondence should be addressed. E-mail: johannes.voit{at}uni-bayreuth.de (J.V.) and marco.grioni{at}epfl.ch (M.G.)

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