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Experimental determination of the Rashba coefficient in InSb/InAlSb quantum wells at zero magnetic field and elevated temperatures

Leontiadou, MA, Litvinenko, KL, Gilbertson, AM, Pidgeon, CR, Branford, WR, Cohen, LF, Fearn, M, Ashley, T, Emeny, MT, Murdin, BN and Clowes, SK (2011) Experimental determination of the Rashba coefficient in InSb/InAlSb quantum wells at zero magnetic field and elevated temperatures JOURNAL OF PHYSICS-CONDENSED MATTER, 23 (3). ? - ?. ISSN 0953-8984

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J._Phys._C_23(2011)035801.pdf - Accepted Version
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Abstract

We report the optical measurement of the spin dynamics at elevated temperatures and in zero magnetic field for two types of degenerately doped n-InSb quantum wells (QWs), one asymmetric (sample A) and one symmetric (sample B) with regards to the electrostatic potential across the QW. Making use of three directly determined experimental parameters: the spin lifetime, τs , the sheet carrier concentration, n, and the electron mobility, μ, we directly extract the zero-field spin splitting. For the asymmetric sample where the Rashba interaction is the dominant source of spin splitting, we deduce a room temperature Rashba parameter of α = 0.09 ± 0.1eV ˚A which is in good agreement with calculations and we estimate the Rashba coefficient α0 (a figure of merit for the ease with which electron spins can be modulated via an electric field). We review the merits/limitations of this approach and the implications of our findings for spintronic devices.

Item Type: Article
Additional Information: Copyright 2011 Institute of Physics. This is the author's accepted manuscript.
Uncontrolled Keywords: Science & Technology, Physical Sciences, Physics, Condensed Matter, Physics, INVERSION ASYMMETRY, SPIN, HETEROSTRUCTURES, SEMICONDUCTOR, ELECTRONS
Related URLs:
Divisions: Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Photonics
Faculty of Engineering and Physical Sciences > Physics
Depositing User: Steven Clowes
Date Deposited: 25 Nov 2011 13:08
Last Modified: 23 Sep 2013 18:51
URI: http://epubs.surrey.ac.uk/id/eprint/7763

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