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Magneto-transport in high mobility n-InSb/InAlSb quantum wells

Branford, W. R., Gilbertson, A. M., Cohen, L. F., Fearn, M., Buckle, Philip Derek and Buckle, L. 2009. Magneto-transport in high mobility n-InSb/InAlSb quantum wells. Presented at: 2009 American Physical Society March Meeting, Pittsburgh, USA, 16-20 March 2009.

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The inherent large spin-orbit (SO) coupling InSb quantum wells (QWs) is expected to result in sensitive tunability of the Rashba effect with electric field. The strength of the SO coupling can be extracted from measurements of weak anti-localisation (WAL) and from the beating of Shubnikov-de Haas (SdH) oscillations [1]. We have investigated these phenomena and report magneto transport measurements from a range of InSb/InAlSb QWs with varying carrier density n and mobility μ. It is shown that the inherent large Zeeman splitting combined with inhomogeneous level broadening means that beating in the SdH oscillations in InSb QWs are rarely observed. However, her we show that in InSb/InAlSb QWs, n can be modulated using a gate electric field from 1.15<n<3.33x10^11cm-2 with 13<μ<38m^2V-1s-1 and that under certain conditions weak beating effects can be observed which are attributable to the Rashba effect. Extracted values of the Rashba parameter from beating [2], WAL and k.p modelling [3] is discussed. [1] V.A.Guzenko et al., PRB 76 (16), 165301 (2007) [2] G.Engels et al., PRB 55 (4), R1958 (1997) [3] A.M.Gilbertson et al., PRB 77 (16), 165335 (2008)

Item Type: Conference or Workshop Item (Paper)
Date Type: Completion
Status: Unpublished
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Last Modified: 04 Jun 2017 04:14

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