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Observation of two relaxation mechanisms in transport between spin split edge states at high imbalance | | E.V. Deviatov
; A. Wurtz
; A. Lorke
; M.Yu. Melnikov
; V.T. Dolgopolov
; D. Reuter
; A.D. Wieck
; | | Date: |
24 Mar 2003 | | Subject: | Mesoscopic Systems and Quantum Hall Effect | cond-mat.mes-hall | | Affiliation: | Institute of Solid State Physics RAS, Chernogolovka, Russia), A. Wurtz, A. Lorke (Laboratorium fur Festkorperphysik, Universitat Duisburg-Essen, Germany), M.Yu. Melnikov, V.T. Dolgopolov (Institute of Solid State Physics RAS, Chernogolovka, Russia), D. | | 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. | | Source: | arXiv, cond-mat/0303498 | | Services: | Forum | Review | PDF | Favorites | |
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