講演情報
[14a-K303-4]Nonlocal Electrical Detection of Reciprocal Orbital Edelstein Effect
〇(D)Weiguang Gao1, Liyang Liao1, Yoshichika Otani1,2,3 (1.Institute for Solid State Physics, 2.Center for Emergent Matter Science, 3.Trans-scale Quantum Science Institute)
キーワード：
orbital Edelstein effect、nonlocal electrical measurement、nonequilibrium orbital moment
The orbital Edelstein effect1–3, where the charge current induces nonequilibrium orbital moment, offers a promising method to manipulate nanomagnets efficiently using light elements1,4–8. Despite extensive research, understanding the Onsager reciprocity of orbital transport—fundamentally rooted in the second law of thermodynamics and time-reversal symmetry—remains elusive. Here, we present our research that experimentally demonstrates the Onsager reciprocity of orbital transport in an orbital Edelstein system2,4–6 by utilizing nonlocal measurements. This method enables the precise identification of the chemical potential generated by orbital accumulation, avoiding the limitations associated with local measurements. Remarkably, we observe that the direct and inverse orbital-charge conversion processes produce identical electrical voltages, confirming Onsager reciprocity in orbital transport. Additionally, we find that the orbital decay length, approximately 100 nm at room temperature, is independent of Cu thickness and decreases with lowering temperature, revealing a distinct contrast to spin transport behavior7.
1.El Hamdi, A. Nat. Phys. 19, 1855–1860 (2023).
2.Go, D. Phys. Rev. B 103, L121113 (2021).
3.Park, S. R. Phys. Rev. Lett. 107, 156803 (2011).
4.Kim, J. Phys. Rev. B 103, L020407 (2021).
5.Kim, J. Phys. Rev. Materials 7, L111401 (2023).
6.Ding, S. Phys. Rev. Lett. 125, 177201 (2020).
7.Kimura, T. Phys. Rev. Lett. 100, 066602 (2008).
1.El Hamdi, A. Nat. Phys. 19, 1855–1860 (2023).
2.Go, D. Phys. Rev. B 103, L121113 (2021).
3.Park, S. R. Phys. Rev. Lett. 107, 156803 (2011).
4.Kim, J. Phys. Rev. B 103, L020407 (2021).
5.Kim, J. Phys. Rev. Materials 7, L111401 (2023).
6.Ding, S. Phys. Rev. Lett. 125, 177201 (2020).
7.Kimura, T. Phys. Rev. Lett. 100, 066602 (2008).