Establishing coherent momentum-space electronic states in locally ordered materials.

Autor: Ciocys ST; Department of Physics, University of California, Berkeley, CA, 94720, USA.; Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA., Marsal Q; Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000, Grenoble, France.; Department of Physics and Astronomy, Uppsala University, Box 516, 751 20, Uppsala, Sweden., Corbae P; Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.; Department of Materials Science, University of California, Berkeley, CA, 94720, USA., Varjas D; Department of Physics, Stockholm University, AlbaNova University Center, 114 21, Stockholm, Sweden.; The Max Planck Institute for the Physics of Complex Systems, 01187, Dresden, Germany.; Department of Theoretical Physics, Institute of Physics, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111, Budapest, Hungary.; IFW Dresden and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtzstrasse 20, 01069, Dresden, Germany., Kennedy E; Department of Materials Science, University of California, Berkeley, CA, 94720, USA.; Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA., Scott M; Department of Materials Science, University of California, Berkeley, CA, 94720, USA.; Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA., Hellman F; Department of Physics, University of California, Berkeley, CA, 94720, USA.; Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA., Grushin AG; Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000, Grenoble, France., Lanzara A; Department of Physics, University of California, Berkeley, CA, 94720, USA. ale.lanzara@berkeley.edu.; Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA. ale.lanzara@berkeley.edu.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2024 Sep 17; Vol. 15 (1), pp. 8141. Date of Electronic Publication: 2024 Sep 17.
DOI: 10.1038/s41467-024-51953-y
Abstrakt: Rich momentum-dependent electronic structure naturally arises in solids with long-range crystalline symmetry. Reliable and scalable quantum technologies rely on materials that are either not perfect crystals or non-crystalline, breaking translational symmetry. This poses the fundamental questions of whether coherent momentum-dependent electronic states can arise without long-range order, and how they can be characterized. Here we investigate Bi 2 Se 3 , which exists in crystalline, nanocrystalline, and amorphous forms, allowing direct comparisons between varying degrees of spatial ordering. Through angle-resolved photoemission spectroscopy, we show for the first time momentum-dependent band structure with Fermi surface repetitions in an amorphous solid. The experimental data is complemented by a model that accurately reproduces the vertical, dispersive features as well as the replication at higher momenta in the amorphous form. These results reveal that well-defined real-space length scales are sufficient to produce dispersive band structures, and that photoemission can expose the imprint of these length scales on the electronic structure.
(© 2024. The Author(s).)
Databáze: MEDLINE
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