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Electronic structure investigations of quasicrystals

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Horn,  Karsten
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Rotenberg, E., Theis, W., & Horn, K. (2004). Electronic structure investigations of quasicrystals. Progress in Surface Science, 75(3-8), 237-253. doi:10.1016/j.progsurf.2004.05.002.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-0BB4-6
Abstract
We present a review of the determination of density of states (DOS) of quasicrystals using valence band photoemission spectroscopy. The absence of fine or spiky structure in the angle-integrated DOS of quasicrystals suggests the possibility of delocalized electronic states. These were confirmed with angle-resolved photoemission studies, which clearly establish the presence of dispersing features attributed to momentum-dependent bandstructure. Such dispersing states are observed not only for deeper-lying sp states, but also for d-derived bands near the Fermi level. Data from three different high symmetry surfaces of decagonal Al–Ni–Co, an ideal model system, are presented. We find that only a few dominant reciprocal lattice vectors are sufficient to describe the quasiperiodic potential, and the implications for electronic properties are discussed.