2024/01/11 by Xin Li, Li, Xin
Physics and Astronomy · #FOS: Physical sciences #Magnetic properties of thin films #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum and electron transport phenomena #Topological Materials and Phenomena
paper · pdf · doi:10.48550/arxiv.2401.06012
openalex publication_date 2024/01/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Comparing with the spin of electron, the electronic orbitals, which have been long ignored in non-equilibrium transport, are getting more and more attentions, due to the prediction and experimental verification of orbital Hall effect (OHE) recently. In this report, the recent advances, including intrinsic mechanisms, direct and indirect experimental observations of OHE, are reviewed comprehensively. The orbital current, generated by OHE, shows much more fundamental features than spin current in explaining Hall conductivity and manipulating magnetization electronically. Theoretically, in momentum space, the OHE is proposed to originate from electric-field driven non-equilibrium orbital texture, based on tight-binding model. However, current experimental works still stay on the level to reveal how the OHE behaves after orbital current is generated, and the unambiguous experimental evidence to verify the generation mechanism of OHE is still missing, limiting the interpretation of OHE. Angle-resolved photoemission spectroscopy with polarized incident photon, on the other hand, could be used to identify the orbital textures on energy band and reveal the non-equilibrium nature of orbital-momentum locking behind OHE, which may help to provide the direct experimental evidence to examine the intrinsic mechanism of OHE, and reveal the nature of wave packet with non-vanishing orbital angular momentum.