Investigation of nonlocal transport associated with the orbital Hall effect in Ti
Keitaro Takashina, Naoki Yano, Asahi Oe, Mari Taniguchi, Shuto Kimura + 1 more
TLDR
Researchers found evidence of the orbital Hall effect in titanium by observing nonlocal resistance, suggesting a new form of orbital transport.
Key contributions
- Observed finite nonlocal resistance in single-layer Ti, despite negligible spin Hall effect.
- Finite-element simulations revealed a sizable Ohmic bypass, suppressed at small channel widths.
- Identified an additional nonlocal resistance component, distinct from the Ohmic bypass.
- This additional component suggests orbital transport driven by the orbital Hall effect in Ti.
Why it matters
This work provides compelling evidence for the orbital Hall effect in titanium, a material with negligible spin Hall effect. It opens new avenues for exploring orbital current-based devices and understanding fundamental charge transport mechanisms.
Original Abstract
We investigate nonlocal transport in single-layer Ti Hall bars to explore signatures of orbital-current transport driven by the orbital Hall effect. Despite the negligible spin Hall effect in Ti, we observe a finite nonlocal resistance in the single-layer Ti Hall bar and study its dependence on the central channel width. Finite-element simulations show that the measured signal contains a sizable Ohmic bypass contribution. However, the bypass contribution is strongly suppressed at small channel widths and cannot fully account for the observed nonlocal resistance even when variations in the Ti resistivity are taken into account. Our results therefore suggest an additional nonlocal contribution distinct from the Ohmic bypass background, which may be associated with orbital transport driven by the orbital Hall effect in Ti.
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