Direct observation of nanometer-scale orbital angular momentum accumulation
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arXiv
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| Autores principales: | , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866917614041694208 |
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| author | Idrobo, Juan Carlos Rusz, Ján Datt, Gopal Jo, Daegeun Alikhah, Sanaz Muradas, David Noumbe, Ulrich Kamalakar, M. Venkata Oppeneer, Peter M. |
| author_facet | Idrobo, Juan Carlos Rusz, Ján Datt, Gopal Jo, Daegeun Alikhah, Sanaz Muradas, David Noumbe, Ulrich Kamalakar, M. Venkata Oppeneer, Peter M. |
| contents | Conversion of charge to orbital angular momentum through the orbital Hall effect (OHE) holds transformative potential for the development of orbital-based electronics, however, it is challenging to directly observe the electrically generated orbital accumulation. Here, we detect the OHE by directly quantifying the orbital accumulation along the edges of a titanium thin film using a scanning transmission electron microscope. We measure the Ti L-edge using electron energy-loss spectroscopy with nanometer resolution and find a sizable orbital accumulation at the sample's outer perimeters, consistent with all signatures expected for the OHE, and determine an orbital diffusion length $\ell_o \approx 7.3$ nm. Our data points to a surprising dependence of the orbital diffusion length on the nano-structural morphology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_09269 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Direct observation of nanometer-scale orbital angular momentum accumulation Idrobo, Juan Carlos Rusz, Ján Datt, Gopal Jo, Daegeun Alikhah, Sanaz Muradas, David Noumbe, Ulrich Kamalakar, M. Venkata Oppeneer, Peter M. Mesoscale and Nanoscale Physics Materials Science Conversion of charge to orbital angular momentum through the orbital Hall effect (OHE) holds transformative potential for the development of orbital-based electronics, however, it is challenging to directly observe the electrically generated orbital accumulation. Here, we detect the OHE by directly quantifying the orbital accumulation along the edges of a titanium thin film using a scanning transmission electron microscope. We measure the Ti L-edge using electron energy-loss spectroscopy with nanometer resolution and find a sizable orbital accumulation at the sample's outer perimeters, consistent with all signatures expected for the OHE, and determine an orbital diffusion length $\ell_o \approx 7.3$ nm. Our data points to a surprising dependence of the orbital diffusion length on the nano-structural morphology. |
| title | Direct observation of nanometer-scale orbital angular momentum accumulation |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2403.09269 |