Ising and XY paramagnons in two-dimensional 2H-NbSe2
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Título: | Ising and XY paramagnons in two-dimensional 2H-NbSe2 |
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Autor/es: | Costa, António T. | Costa, Marcio | Fernández-Rossier, Joaquín |
Grupo/s de investigación o GITE: | Grupo de Nanofísica |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Física Aplicada |
Palabras clave: | Paramagnons | 2H−NbSe2 monolayers | Spin fluctuations |
Área/s de conocimiento: | Física de la Materia Condensada |
Fecha de publicación: | 21-jun-2022 |
Editor: | American Physical Society |
Cita bibliográfica: | Physical Review B. 2022, 105: 224412. https://doi.org/10.1103/PhysRevB.105.224412 |
Resumen: | Paramagnons are the collective modes that govern the spin response of nearly magnetic conductors. In some cases they mediate electron pairing leading to superconductivity. This scenario may occur in 2H−NbSe2 monolayers, that feature spin-valley coupling on account of spin-orbit interactions and their lack of inversion symmetry. Here we explore spin anisotropy of paramagnons both for noncentrosymmetric Kane-Mele-Hubbard models for 2H−NbSe2 monolayers described with a DFT-derived tight-binding model. In the infinite wavelength limit we find spatially uniform paramagnons with energies around 1 meV that feature a colossal off-plane uniaxial magnetic anisotropy, with quenched transversal spin response. At finite wave vectors, longitudinal and transverse channels reverse roles: XY fluctuations dominate within a significant portion of the Brillouin zone. Our results show that 2H−NbSe2 is close to a Coulomb-driven in-plane (XY) spin density wave instability. |
Patrocinador/es: | We acknowledge financial support from the Ministry of Science and Innovation of Spain (Grant No. PID2019-109539GB-41), from Generalitat Valenciana (Grant No. Prometeo2021/017), and from Fundação Para a Ciência e a Tecnologia, Portugal (Grant No. PTDC/FISMAC/2045/2021). J.F.-R. acknowledges funding from FEDER/Junta de Andalucía-Consejería de Transformación Económica, Industria, Conocimiento y Universidades, Grant No. P18-FR-4834. |
URI: | http://hdl.handle.net/10045/124518 |
ISSN: | 2469-9950 (Print) | 2469-9969 (Online) |
DOI: | 10.1103/PhysRevB.105.224412 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2022 American Physical Society |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1103/PhysRevB.105.224412 |
Aparece en las colecciones: | INV - Grupo de Nanofísica - Artículos de Revistas |
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Costa_etal_2022_PhysRevB.pdf | 1,21 MB | Adobe PDF | Abrir Vista previa | |
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