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arXiv · 0809.0764

Fine structure in the electronic density of states of Al-Ni-Co decagonal quasicrystal from ultrafast time-resolved optical reflectivity

T. Mertelj·A. Oslak·J. Dolinsek·I. R. Fisher·V. V. Kabanov·D. Mihailovic
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Abstract

We measured the temperature and fluence dependence of the time-resolved photoinduced optical reflectivity in a decagonal Al_{71.9}Ni_{11.1}Co_{17.0} quasicrystal. We find no evidence for the relaxation of a hot thermalized electron gas as observed in metals. Instead, a quick diffusion of the hot nonthermal carries ~40 nm into the bulk is detected enhanced by the presence of a broad ~1 eV pseudogap. From the relaxation dynamics we find an evidence for the presence of a fine structure in the electronic density of states around ~13 meV from the Fermi energy. The structure is related to a weak bottleneck for the carrier relaxation observed at low temperatures.

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T. Mertelj, A. Oslak, J. Dolinsek, I. R. Fisher, V. V. Kabanov, D. Mihailovic. 2008-09-08. Fine structure in the electronic density of states of Al-Ni-Co decagonal quasicrystal from ultrafast time-resolved optical reflectivity. https://doi.org/10.1103/physrevlett.102.086405

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