Observation of two relaxation mechanisms in transport between spin split edge states at high imbalance

Abstract

Using a quasi-Corbino geometry to directly study electron transport between spin-split edge states, we find a pronounced hysteresis in the I-V curves, originating from slow relaxation processes. We attribute this long-time relaxation to the formation of a dynamic nuclear polarization near the sample edge. The determined characteristic relaxation times are 25 s and 200 s which points to the presence of two different relaxation mechanisms. The two time constants are ascribed to the formation of a local nuclear polarization due to flip-flop processes and the diffusion of nuclear spins.

arXiv commentSubmitted to PRB

References in corpus (3)

• Dynamic nuclear polarization at the edge of a two-dimensional electron gas
• Separately contacted edge states: A new spectroscopic tool for the investigation of the quantum Hall effect
• Electronic transport through nuclear-spin-polarization-induced quantum wire

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