Quantifying quasiparticle chirality in a chiral topological semimetal
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , , , , , , , , , , , , , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2026
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866914395851849728 |
|---|---|
| author | Wang, Jiaju Sánchez-Barriga, Jaime Kumar, Amit Pardo-Almanza, Markel Cardenas-Gamboa, Jorge Robredo, Iñigo Shekhar, Chandra Geng, Daiyu McFarlane, Emily C. Trautmann, Martin Della Valle, Enrico Hoesch, Moritz Huang, Meng-Jie Buck, Jens Strocov, Vladimir N. Johansson, Annika Parkin, Stuart S. P. Felser, Claudia Vergniory, Maia G. Schröter, Niels B. M. |
| author_facet | Wang, Jiaju Sánchez-Barriga, Jaime Kumar, Amit Pardo-Almanza, Markel Cardenas-Gamboa, Jorge Robredo, Iñigo Shekhar, Chandra Geng, Daiyu McFarlane, Emily C. Trautmann, Martin Della Valle, Enrico Hoesch, Moritz Huang, Meng-Jie Buck, Jens Strocov, Vladimir N. Johansson, Annika Parkin, Stuart S. P. Felser, Claudia Vergniory, Maia G. Schröter, Niels B. M. |
| contents | Recently, the projection of the electron's spin on its crystal momentum has been proposed as a metric to quantify electronic chirality of Bloch states in crystals, which is expected to affect a wide range of physical properties, such as magnetoelectric and optical responses. However, a direct experimental quantification of this chirality metric over an entire iso-energy surface has remained elusive. Here, we have used spin- and angle-resolved photoemission spectroscopy to directly probe the electronic chirality by measuring the bulk spin texture of Kramers-Weyl and Weyl cones in RhSi, a chiral topological semimetal with strong spin-orbit coupling (SOC). After quantifying the SOC splitting of Weyl cones, we determine their spin direction along different azimuthal angles to extract energy dependent the deviations (up to ~40°) from perfect parallel spin-momentum locking. From these deviations we define an energy-dependent normalized electron chirality density (NECD), a directly accessible metric of bulk electronic chirality. In RhSi, the NECD decreases from 1 at the Kramers-Weyl point to ~0.8 at ~200 meV below it. Finally, we show that this experimentally grounded NECD provides predictive power for magneto-optical and transport responses of chiral materials, exemplified by the longitudinal Edelstein effect. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_14640 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Quantifying quasiparticle chirality in a chiral topological semimetal Wang, Jiaju Sánchez-Barriga, Jaime Kumar, Amit Pardo-Almanza, Markel Cardenas-Gamboa, Jorge Robredo, Iñigo Shekhar, Chandra Geng, Daiyu McFarlane, Emily C. Trautmann, Martin Della Valle, Enrico Hoesch, Moritz Huang, Meng-Jie Buck, Jens Strocov, Vladimir N. Johansson, Annika Parkin, Stuart S. P. Felser, Claudia Vergniory, Maia G. Schröter, Niels B. M. Mesoscale and Nanoscale Physics Other Condensed Matter Recently, the projection of the electron's spin on its crystal momentum has been proposed as a metric to quantify electronic chirality of Bloch states in crystals, which is expected to affect a wide range of physical properties, such as magnetoelectric and optical responses. However, a direct experimental quantification of this chirality metric over an entire iso-energy surface has remained elusive. Here, we have used spin- and angle-resolved photoemission spectroscopy to directly probe the electronic chirality by measuring the bulk spin texture of Kramers-Weyl and Weyl cones in RhSi, a chiral topological semimetal with strong spin-orbit coupling (SOC). After quantifying the SOC splitting of Weyl cones, we determine their spin direction along different azimuthal angles to extract energy dependent the deviations (up to ~40°) from perfect parallel spin-momentum locking. From these deviations we define an energy-dependent normalized electron chirality density (NECD), a directly accessible metric of bulk electronic chirality. In RhSi, the NECD decreases from 1 at the Kramers-Weyl point to ~0.8 at ~200 meV below it. Finally, we show that this experimentally grounded NECD provides predictive power for magneto-optical and transport responses of chiral materials, exemplified by the longitudinal Edelstein effect. |
| title | Quantifying quasiparticle chirality in a chiral topological semimetal |
| topic | Mesoscale and Nanoscale Physics Other Condensed Matter |
| url | https://arxiv.org/abs/2603.14640 |