Parallel spin-momentum locking in a chiral topological semimetal
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arXiv
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| Natura: | Preprint |
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2022
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| author | Krieger, Jonas A. Stolz, Samuel Robredo, Inigo Manna, Kaustuv McFarlane, Emily C. Date, Mihir Guedes, Eduardo B. Dil, J. Hugo Shekhar, Chandra Borrmann, Horst Yang, Qun Lin, Mao Strocov, Vladimir N. Caputo, Marco Pal, Banabir Watson, Matthew D. Kim, Timur K. Cacho, Cephise Mazzola, Federico Fujii, Jun Vobornik, Ivana Parkin, Stuart S. P. Bradlyn, Barry Felser, Claudia Vergniory, Maia G. Schröter, Niels B. M. |
| author_facet | Krieger, Jonas A. Stolz, Samuel Robredo, Inigo Manna, Kaustuv McFarlane, Emily C. Date, Mihir Guedes, Eduardo B. Dil, J. Hugo Shekhar, Chandra Borrmann, Horst Yang, Qun Lin, Mao Strocov, Vladimir N. Caputo, Marco Pal, Banabir Watson, Matthew D. Kim, Timur K. Cacho, Cephise Mazzola, Federico Fujii, Jun Vobornik, Ivana Parkin, Stuart S. P. Bradlyn, Barry Felser, Claudia Vergniory, Maia G. Schröter, Niels B. M. |
| contents | Spin-momentum locking in solids describes a directional relationship between the electron's spin angular momentum and its linear momentum over the entire Fermi surface. While orthogonal spin-momentum locking, such as Rashba spin-orbit coupling, has been studied for decades and inspired a vast number of applications, its natural counterpart, the purely parallel spin-momentum locking, has remained elusive in experiments. Recently, chiral topological semimetals that host single- and multifold band crossings have been predicted to realize such parallel locking. Here, we use spin- and angle-resolved photoelectron spectroscopy to probe spin-momentum locking of a multifold fermion in the chiral topological semimetal PtGa via the spin-texture of its topological Fermi-arc surface states. We find that the electron spin of the Fermi-arcs points orthogonal to their Fermi surface contour for momenta close to the projection of the bulk multifold fermion, which is consistent with parallel spin-momentum locking of the latter. We anticipate that our discovery of parallel spin-momentum locking of multifold fermions will lead to the integration of chiral topological semimetals in novel spintronic devices, and the search for spin-dependent superconducting and magnetic instabilities in these materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2210_08221 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Parallel spin-momentum locking in a chiral topological semimetal Krieger, Jonas A. Stolz, Samuel Robredo, Inigo Manna, Kaustuv McFarlane, Emily C. Date, Mihir Guedes, Eduardo B. Dil, J. Hugo Shekhar, Chandra Borrmann, Horst Yang, Qun Lin, Mao Strocov, Vladimir N. Caputo, Marco Pal, Banabir Watson, Matthew D. Kim, Timur K. Cacho, Cephise Mazzola, Federico Fujii, Jun Vobornik, Ivana Parkin, Stuart S. P. Bradlyn, Barry Felser, Claudia Vergniory, Maia G. Schröter, Niels B. M. Mesoscale and Nanoscale Physics Materials Science Other Condensed Matter Strongly Correlated Electrons Spin-momentum locking in solids describes a directional relationship between the electron's spin angular momentum and its linear momentum over the entire Fermi surface. While orthogonal spin-momentum locking, such as Rashba spin-orbit coupling, has been studied for decades and inspired a vast number of applications, its natural counterpart, the purely parallel spin-momentum locking, has remained elusive in experiments. Recently, chiral topological semimetals that host single- and multifold band crossings have been predicted to realize such parallel locking. Here, we use spin- and angle-resolved photoelectron spectroscopy to probe spin-momentum locking of a multifold fermion in the chiral topological semimetal PtGa via the spin-texture of its topological Fermi-arc surface states. We find that the electron spin of the Fermi-arcs points orthogonal to their Fermi surface contour for momenta close to the projection of the bulk multifold fermion, which is consistent with parallel spin-momentum locking of the latter. We anticipate that our discovery of parallel spin-momentum locking of multifold fermions will lead to the integration of chiral topological semimetals in novel spintronic devices, and the search for spin-dependent superconducting and magnetic instabilities in these materials. |
| title | Parallel spin-momentum locking in a chiral topological semimetal |
| topic | Mesoscale and Nanoscale Physics Materials Science Other Condensed Matter Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2210.08221 |