Regensburg 2019 – scientific programme
TT 35.1: Talk
Tuesday, April 2, 2019, 14:00–14:15, H23
Long-lived chirality states in low-temperature strongly-coupled Rashba systems — •Philipp C. Verpoort, James R. A. Dann, Gareth J. Conduit, and Vijay Narayan — Department of Physics, University of Cambridge, J.J. Thomson Avenue, Cambridge CB3 0HE, UK
We observe ultra-slow magnetoresistance dynamics at sub-Kelvin temperatures in various systems that display strong Rashba spin-orbit coupling. These dynamics display a striking magnetoresistance curve that follows different traces depending on direction and speed of a magnetic field sweep. This novel effect cannot be explained by magnetisation or magnetocaloric effects. We suggest that the dynamics arise from detuning of the Fermi levels of the two Rashba bands and the slowness of their relaxation into equilibrium due to the suppression of interband scattering mechanisms that would be expected in conventional systems. Surprisingly, the relaxation timescale of this non-equilibrium state is 10 seconds so exceeds typical electronic relaxation timescales by several orders of magnitude, which makes this effect intriguing to study and relevant for potential applications in information processing.