Observation of an isolated flat band in the van der Waals crystal NbOCl2

URN to cite this document:: urn:nbn:de:bvb:355-epub-786954
DOI to cite this document:: 10.5283/epub.78695

Bao, Changhua ; Eggers, Vincent ; Meierhofer, Manuel

; Helml, Jakob

; Münster, Lasse ; Ito, Suguru ; Machtl, Leon ; Zajusch, Sarah ; Inzani, Giacomo ; Wittmann, Ludwig ; Liebich, Marlene

; Wallauer, Robert ; Höfer, Ulrich ; Huber, Rupert

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Date of publication of this fulltext: 16 Feb 2026 12:14

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Abstract

Dispersionless electronic bands lead to an extremely high density of states and suppressed kinetic energy, thereby increasing electronic correlations and instabilities that can shape emergent ordered states, such as excitonic, ferromagnetic, and superconducting phases. A flat band that extends over the entire momentum space and is well isolated from other dispersive bands is, therefore, ...