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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Official URL: http://dx.doi.org/10.1088/0953-8984/23/3/035801
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.
|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|
|Divisions:||Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Photonics |
Faculty of Engineering and Physical Sciences > Physics
|Deposited By:||Steven Clowes|
|Deposited On:||25 Nov 2011 13:08|
|Last Modified:||11 May 2013 14:45|
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