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Direct observation of nanometer-scale orbital angular momentum accumulation
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abstract
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.
Forward citations
Cited by 2 Pith papers
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Detection and control of electronic orbital magnetism by spin waves in honeycomb ferromagnets
Spin waves in honeycomb ferromagnets can imprint and steer electronic orbital magnetism, with signatures depending on magnon mode, DMI, Kitaev interaction, and magnetic field.
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