Anderson localization of electron states in a quasicrystal

The influence of disorder on the critical electron states in a quasiperiodic lattice is a subject of intense research. In this work, we report the occurrence of Anderson localization in an icosahedral (i) polygrain quasicrystal Al-Pd-Re due to site disorder using hard x-ray photoemission spectroscop...

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Bibliographic Details
Published in:Physical review. B 2021-06, Vol.103 (24), Article L241106
Main Authors: Sarkar, Shuvam, Krajčí, Marian, Sadhukhan, Pampa, Singh, Vipin Kumar, Gloskovskii, Andrei, Mandal, Prabhat, Fournée, Vincent, de Weerd, Marie-Cecile, Ledieu, Julian, Fisher, Ian R., Roy Barman, Sudipta
Format: Article
Language:English
Subjects:
Anderson localization
Condensed Matter
Density functional theory
Electron states
Electrons
Hopping conduction
Localization
Materials Science
Photoelectric emission
Photoelectron spectroscopy
Physics
Quasicrystals
Spectrum analysis
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Summary:The influence of disorder on the critical electron states in a quasiperiodic lattice is a subject of intense research. In this work, we report the occurrence of Anderson localization in an icosahedral (i) polygrain quasicrystal Al-Pd-Re due to site disorder using hard x-ray photoemission spectroscopy, resistivity, and density functional theory (DFT). Photoemission spectroscopy shows that the density of states is enhanced at the Fermi level in polygrain i-Al-Pd-Re compared to single-grain i-Al-Pd-Re. In contrast, the conductivity of the former is an order of magnitude reduced compared to the latter, indicating that these electron states are localized. DFT shows that these states originate primarily from Re 5d-Pd 4d hybridization and are enhanced in polygrain i-Al-Pd-Re due to compositional difference, but are broadened because of disorder that brings about Anderson localization. This is established by the Mott variable range hopping behavior of conductivity, and the estimated localization length is 23 Å.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.103.L241106