Investigation of nonlocal transport associated with the orbital Hall effect in Ti

TL;DR

This study explores nonlocal transport in single-layer Ti Hall bars, providing evidence for orbital-current transport driven by the orbital Hall effect, distinct from Ohmic contributions.

Contribution

It presents experimental evidence of orbital transport in Ti, highlighting a nonlocal signal not explained by Ohmic bypass, indicating orbital Hall effect involvement.

Findings

Finite nonlocal resistance observed in Ti Hall bars.

Ohmic bypass contribution is suppressed at small channel widths.

Nonlocal resistance cannot be fully explained by Ohmic effects, suggesting orbital transport.

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.