Artículo
Magnetic warping in topological insulators
Naselli, Gabriele; Moghaddam, Ali G.; Di Napoli, Solange Mariel
; Vildosola, Veronica Laura
; Fulga, Ion Cosma; Van den Brink, Jeroen; Facio, Jorge Ismael
Fecha de publicación:
09/2022
Editorial:
American Physical Society
Revista:
Physical Review Research
ISSN:
2643-1564
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We analyze the electronic structure of topological surface states in the family of magnetic topological insulators MnBi2nTe3n+1. We show that, at natural-cleavage surfaces, the Dirac cone warping changes its symmetry from hexagonal to trigonal at the magnetic ordering temperature. In particular, an energy splitting develops between the surface states of the same band index but opposite surface momenta upon formation of the long-range magnetic order. As a consequence, measurements of such energy splittings constitute a simple protocol to detect the magnetic ordering via the surface electronic structure, alternative to the detection of the surface magnetic gap. Interestingly, while the latter signals a nonzero surface magnetization, the trigonal warping predicted here is, in addition, sensitive to the direction of the surface magnetic flux. Our results may be particularly useful when the Dirac point is buried in the projection of the bulk states, caused by certain terminations of the crystal or in hole-doped systems, since in both situations the surface magnetic gap itself is not accessible in photoemission experiments.
Palabras clave:
MAGNETIC
,
TOPOLOGICAL
,
INSULATORS
,
WARPING
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Articulos (UE-INN - NODO BARILOCHE)
Articulos de UNIDAD EJECUTORA INSTITUTO DE NANOCIENCIA Y NANOTECNOLOGIA - NODO BARILOCHE
Articulos de UNIDAD EJECUTORA INSTITUTO DE NANOCIENCIA Y NANOTECNOLOGIA - NODO BARILOCHE
Articulos (UE-INN - NODO CONSTITUYENTES)
Articulos de UNIDAD EJECUTORA INSTITUTO DE NANOCIENCIA Y NANOTECNOLOGIA - NODO CONSTITUYENTES
Articulos de UNIDAD EJECUTORA INSTITUTO DE NANOCIENCIA Y NANOTECNOLOGIA - NODO CONSTITUYENTES
Citación
Naselli, Gabriele; Moghaddam, Ali G.; Di Napoli, Solange Mariel; Vildosola, Veronica Laura; Fulga, Ion Cosma; et al.; Magnetic warping in topological insulators; American Physical Society; Physical Review Research; 4; 3; 9-2022; 1-9
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