In:
Applied Physics Letters, AIP Publishing, Vol. 122, No. 23 ( 2023-06-05)
Kurzfassung:
Phonon-based Weyl points (WPs) are usually considered to appear in pairs with opposite chirality. Here, we report the phonon dispersion in a realistic material monosodium phosphoramidate, NaHPO3NH2, which has two types of unpaired WP phonon systems: (i) two hourglass charge-3 (C-3) WPs and six C-1 conventional WPs forming a topological Weyl complex; (ii) one C-2 WP, with a topologically charged Weyl nodal surface, forming a topologically charged Weyl point-surface system. Remarkably, the simultaneous presence of the C-1, C-2, and hourglass C-3 WPs in NaHPO3NH2 results in the formation of clean and long phononic double and sextuple-helicoid surface states on the (101¯0) and (001) surfaces, respectively. The phononic double and sextuple-helicoid surface states span the entire first surface Brillouin zones of the (101¯0) and (001) surfaces, which will facilitate their detection in future experimental studies.
Materialart:
Online-Ressource
ISSN:
0003-6951
,
1077-3118
Sprache:
Englisch
Verlag:
AIP Publishing
Publikationsdatum:
2023
ZDB Id:
211245-0
ZDB Id:
1469436-0
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