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Experimental determination of the Rashba coefficient in InSb/InAlSb quantum wells at zero magnetic field and elevated temperatures
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Leontiadou, M. A., Litvinenko, K. L., Gilbertson, A. M., Pidgeon, C. R., Branford, W. R., Cohen, L. F., Fearn, M., Ashley, Tim, Emeny, M. T., Murdin, B. N. and Clowes, S. K. (2011) Experimental determination of the Rashba coefficient in InSb/InAlSb quantum wells at zero magnetic field and elevated temperatures. Journal of Physics: Condensed Matter, Volume 23 (Number 3). Article number 035801. doi:10.1088/0953-8984/23/3/035801 ISSN 0953-8984.
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Official URL: http://dx.doi.org/10.1088/0953-8984/23/3/035801
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 ± 0.1 eV Å 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: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||
| Journal or Publication Title: | Journal of Physics: Condensed Matter | ||||
| Publisher: | Institute of Physics Publishing Ltd. | ||||
| ISSN: | 0953-8984 | ||||
| Official Date: | 5 February 2011 | ||||
| Dates: |
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| Volume: | Volume 23 | ||||
| Number: | Number 3 | ||||
| Article Number: | Article number 035801 | ||||
| DOI: | 10.1088/0953-8984/23/3/035801 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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