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arXiv · 2411.00353

Orbital Edelstein effect of electronic itinerant orbital motion at edges

Jongjun M. Lee·Min Ju Park·Hyun-Woo Lee
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Abstract

In the study of orbital angular momentum (OAM), the focus has been predominantly on the intra-atomic contribution. However, recent research has begun to shift towards exploring the inter-atomic contribution to OAM dynamics. In this paper, we investigate the orbital Edelstein effect (OEE) arising from the inter-atomic OAM at the edges. We explore the OAM texture within edge states and unveil the OAM accumulation at the edges using several lattice models based on the $s$ orbital. By comparing slabs with differently shaped edges, we not only clarify the role of electron wiggling motion in shaping OAM texture but also highlight the absence of bulk-boundary correspondence in the accumulation process. The topological insulator and higher-order topological insulator models further confirm these findings and provide evidence for the relationship between the higher-order topology and the OEE. Our study advances the comprehension of orbital physics and extends its scope to higher-order topological insulators.

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Jongjun M. Lee, Min Ju Park, Hyun-Woo Lee. 2024-11-01. Orbital Edelstein effect of electronic itinerant orbital motion at edges. https://doi.org/10.1103/physrevb.110.134436

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