Intrinsic Chern Half-Metal with High Anomalous Hall Conductivity in 2D BaNiCl$_3$
Fuente:
arXiv
Salvato in:
| Autori principali: | , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2025
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866916716648333312 |
|---|---|
| author | Nwaogbo, Chidiebere I. Ekuma, Chinedu E. |
| author_facet | Nwaogbo, Chidiebere I. Ekuma, Chinedu E. |
| contents | Two-dimensional (2D) half-metals offer complete spin polarization at the Fermi level, making them candidates for dissipationless spin transport. Yet intrinsic 2D half-metals exhibiting robust topological features, particularly large Chern number anomalous Hall conductivities, remain exceptionally rare. Using first-principles calculations, we identify atomically thin BaNiCl$_3$, a layered halide perovskite (perovskene), as a topological half-metal. It exhibits a high Chern number ($C \ge 2$), a large anomalous Hall conductivity of 316~$Ω^{-1},\mathrm{cm}^{-1}$, and a Fermi velocity of $\approx 0.78 \times 10^6$ m/s. The coexistence of complete spin polarization and high carrier velocity suggests low-dissipation spin transport. Spin-orbit coupling opens a sizable topological gap of $\sim 20\,$ meV, yielding nontrivial Berry curvature and enhancing the anomalous Hall response. Ferromagnetism is stabilized by the Ni$^{2+}$ ($d^8$) configuration and Cl-mediated superexchange, supporting magnetic ordering at elevated temperatures. These results establish BaNiCl$_3$ as a rare intrinsic Chern half-metal, with potential applications in quantum and spintronic technologies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_00840 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Intrinsic Chern Half-Metal with High Anomalous Hall Conductivity in 2D BaNiCl$_3$ Nwaogbo, Chidiebere I. Ekuma, Chinedu E. Mesoscale and Nanoscale Physics Materials Science Two-dimensional (2D) half-metals offer complete spin polarization at the Fermi level, making them candidates for dissipationless spin transport. Yet intrinsic 2D half-metals exhibiting robust topological features, particularly large Chern number anomalous Hall conductivities, remain exceptionally rare. Using first-principles calculations, we identify atomically thin BaNiCl$_3$, a layered halide perovskite (perovskene), as a topological half-metal. It exhibits a high Chern number ($C \ge 2$), a large anomalous Hall conductivity of 316~$Ω^{-1},\mathrm{cm}^{-1}$, and a Fermi velocity of $\approx 0.78 \times 10^6$ m/s. The coexistence of complete spin polarization and high carrier velocity suggests low-dissipation spin transport. Spin-orbit coupling opens a sizable topological gap of $\sim 20\,$ meV, yielding nontrivial Berry curvature and enhancing the anomalous Hall response. Ferromagnetism is stabilized by the Ni$^{2+}$ ($d^8$) configuration and Cl-mediated superexchange, supporting magnetic ordering at elevated temperatures. These results establish BaNiCl$_3$ as a rare intrinsic Chern half-metal, with potential applications in quantum and spintronic technologies. |
| title | Intrinsic Chern Half-Metal with High Anomalous Hall Conductivity in 2D BaNiCl$_3$ |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2505.00840 |