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

Leontiadou, M ORCID: https://orcid.org/0000-0003-2616-1841, 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) .

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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, τ(s), 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 ± 0.1 eV Å which is in good agreement with calculations and we estimate the Rashba coefficient α(0) (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
Schools: Schools > School of Computing, Science and Engineering
Journal or Publication Title: Journal of Physics - Condensed Matter
Publisher: IOP Publishing
ISSN: 0953-8984
Related URLs:
Funders: Engineering and Physical Sciences Research Council (EPSRC)
Depositing User: Dr MARINA LEONTIADOU
Date Deposited: 02 Apr 2019 08:59
Last Modified: 02 Apr 2019 08:59
URI: http://usir.salford.ac.uk/id/eprint/50837

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