The electronic structure of intertwined kagome, honeycomb, and triangular sublattices of the intermetallics MCo2Al9 (M = Sr, Ba)

Chiara Bigi, Sahar Pakdel, Michał J. Winiarski, Pasquale Orgiani, Ivana Vobornik, Jun Fujii, Giorgio Rossi, Vincent Polewczyk, Phil D. C. King, Giancarlo Panaccione, Tomasz Klimczuk, Kristian Sommer Thygesen, Federico Mazzola

Research output: Contribution to journalArticlepeer-review

3 Downloads (Pure)

Abstract

Intermetallics are an important playground to stabilize a large variety of physical phenomena, arising from their complex crystal structure. The ease of their chemical tunabilty makes them suitable platforms to realize targeted electronic properties starting from the symmetries hidden in their unit cell. Here, we investigate the family of the recently discovered intermetallics M Co2Al9 (M = Sr, Ba) and we unveil their electronic structure. By using angle-resolved photoelectron spectroscopy and density functional theory calculations, we discover the existence of Dirac-like dispersions as ubiquitous features in this family, coming from the hidden kagome and honeycomb symmetries embedded in the unit cell. Finally, from calculations, we expect that the spin-orbit coupling is responsible for opening energy gaps in the electronic structure spectrum, which also affects the majority of the observed Dirac-like states. Our study constitutes an experimental observation of the electronic structure of M Co2Al9 and proposes these systems as hosts of Dirac-like physics with intrinsic spin-orbit coupling. The latter effect suggests M Co2Al9 as a future platform for investigating the emergence of nontrivial topology.
Original languageEnglish
Article number075148
Number of pages7
JournalPhysical Review. B, Condensed matter and materials physics
Volume108
Issue number7
DOIs
Publication statusPublished - 21 Aug 2023

Fingerprint

Dive into the research topics of 'The electronic structure of intertwined kagome, honeycomb, and triangular sublattices of the intermetallics MCo2Al9 (M = Sr, Ba)'. Together they form a unique fingerprint.

Cite this