Orbital Topology of Chiral Crystals for Orbitronics
Abstract
Abstract Chirality is ubiquitous in nature and manifests in a wide range of phenomena including chemical reactions, biological processes, and quantum transport of electrons. In quantum materials, the chirality of fermions, given by the relative directions between the electron spin and momentum, is connected to the band topology of electronic states. This study shows that in structurally chiral materials like CoSi, the orbital angular momentum (OAM) serves as the main driver of a nontrivial band topology in this new class of unconventional topological semimetals, even when spin‐orbit coupling is negligible. A nontrivial orbital‐momentum locking of multifold chiral fermions in the bulk leads to a pronounced OAM texture of the helicoid Fermi arcs at the surface. The study highlights the pivotal role of the orbital degree of freedom for the chirality and topology of electron states, in general, and paves the way towards the application of topological chiral semimetals in orbitronic devices.
Article Details
Authors (17)
Kenta Hagiwara
Peter Grünberg Institut (PGI‐6) Forschungszentrum Jülich 52425 Jülich Germany
Ying‐Jiun Chen
Peter Grünberg Institut (PGI‐6) Forschungszentrum Jülich 52425 Jülich Germany
Dongwook Go
Institute of Physics, Johannes Gutenberg-University Mainz, Mainz, Germany.
Xin Liang Tan
Peter Grünberg Institut (PGI‐6) Forschungszentrum Jülich 52425 Jülich Germany
Sergii Grytsiuk
Kui‐Hon Ou Yang
Department of Physics National Taiwan University Taipei 10617 Taiwan
Guo‐Jiun Shu
Department of Materials and Mineral Resources Engineering National Taipei University of Technology Taipei 10608 Taiwan
Jing Chien
Department of Physics National Taiwan University Taipei 10617 Taiwan
Yi‐Hsin Shen
Department of Physics National Taiwan University Taipei 10617 Taiwan
Xiang‐Lin Huang
Department of Materials and Mineral Resources Engineering National Taipei University of Technology Taipei 10608 Taiwan
Iulia Cojocariu
Peter Grünberg Institut (PGI‐6) Forschungszentrum Jülich 52425 Jülich Germany
Vitaliy Feyer
Peter Grünberg Institute (PGI‐6) Jülich Research Center Jülich Germany
Minn‐Tsong Lin
Department of Physics National Taiwan University Taipei 10617 Taiwan
Stefan Blügel
Claus Michael Schneider
Peter Grünberg Institut (PGI‐6) Forschungszentrum Jülich 52425 Jülich Germany
Yuriy Mokrousov
Institute of Physics, Johannes Gutenberg-University Mainz, Mainz, Germany.
Christian Tusche
Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich 1 , 52425 Jülich,