Establishing coherent momentum-space electronic states in locally ordered materials

Samuel T. Ciocys, Quentin Marsal, Paul Corbae, Daniel Varjas, Ellis Kennedy, Mary Scott, Frances Hellman, Adolfo G. Grushin and Alessandra Lanzara ()
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Samuel T. Ciocys: University of California
Quentin Marsal: Institut Néel
Paul Corbae: Lawrence Berkeley National Laboratory
Daniel Varjas: Stockholm University, AlbaNova University Center
Ellis Kennedy: University of California
Mary Scott: University of California
Frances Hellman: University of California
Adolfo G. Grushin: Institut Néel
Alessandra Lanzara: University of California

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract 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 Bi2Se3, 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.

Date: 2024
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DOI: 10.1038/s41467-024-51953-y

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