Orbital Topology of Chiral Crystals for Orbitronics
Journal
Advanced Materials
Journal Volume
37
Journal Issue
27
Start Page
2418040
ISSN
0935-9648
1521-4095
Date Issued
2025-05-02
Author(s)
Hagiwara, Kenta
Chen, Ying‐Jiun
Go, Dongwook
Tan, Xin Liang
Grytsiuk, Sergii
Yang, Kui‐Hon Ou
Shu, Guo‐Jiun
Chien, Jing
Shen, Yi‐Hsin
Huang, Xiang‐Lin
Cojocariu, Iulia
Feyer, Vitaliy
Blügel, Stefan
Schneider, Claus Michael
Mokrousov, Yuriy
Tusche, Christian
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.
Subjects
chirality
circular dichroism
fermi arc
momentum microscopy
orbital angular momentum
orbital topology
orbitronics
SDGs
Publisher
Wiley
Type
journal article