Negative nonlocal resistance in mesoscopic gold Hall bars: Absence of giant spin Hall effect

Details Negative nonlocal resistance in mesoscopic gold Hall bars: Absence of giant spin Hall effect Negative nonlocal resistance in mesoscopic gold Hall bars: Absence of giant spin Hall effect

2009-02-21

arxiv.org/abs/0902.3686v1

Phys. Rev. Lett. 103, 166601 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.103.166601

We report the observation of negative nonlocal resistances in multiterminal mesoscopic gold Hall bar structures whose characteristic dimensions are larger than the electron mean-free path. Our results can only be partially explained by a classical diffusive model of the nonlocal transport, and are not consistent with a recently proposed model based on spin Hall effects. Instead, our analysis suggests that a quasiballistic transport mechanism is responsible for the observed negative nonlocal resistance. Based on the sensitivity of our measurements and the spin Hall effect model, we find an upper limit for the spin Hall angle in gold of 0.022 at 4.5 K.

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