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Towards coherent optical control of a single hole spin: rabi rotation of a trion conditional on the spin state of the hole

Ramsay, A.J., Boyle, S.J., Godden, T.M., Kolodka, R.S., Khatab, A.F.A., Oliveira, J.B.B., Skiba-Szymanska, J., Liu, H.Y., Hopkinson, M., Fox, A.M. and Skolnick, M.S. (2009) Towards coherent optical control of a single hole spin: rabi rotation of a trion conditional on the spin state of the hole. Solid State Communications, 149 (35-36). pp. 1458-1465. ISSN 0038-1098

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A hole spin is a potential solid-state q-bit, that may be more robust against nuclear spin induced dephasing than an electron spin. Here we propose and demonstrate the sequential preparation, control and detection of a single hole spin trapped on a self-assembled InGaAs/GaAs quantum dot. The dot is embedded in a photodiode structure under an applied electric field. Fast, triggered, initialization of a hole spin is achieved by creating a spin-polarized electron-hole pair with a picosecond laser pulse, and in an applied electric field, waiting for the electron to tunnel leaving a spin-polarized hole. Detection of the hole spin with picoseconds time resolution is achieved using a second picosecond laser pulse to probe the positive trion transition, where a trion is created conditional on the hole spin being detected as a change in photocurrent. Finally, using this setup we observe a Rabi rotation of the hole-trion transition that is conditional on the hole spin, which for a pulse area of 2 pi can be used to impart a phase shift of pi between the hole spin states, a non-general manipulation of the hole spin. (C) 2009 Elsevier Ltd. All rights reserved.

Item Type: Article
Copyright, Publisher and Additional Information: © 2009 Elsevier. This is an author produced version of a paper subsequently published in Solid State Communications. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: Quantum dots; Spin dynamics; Coherent control
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield)
The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield)
Depositing User: Miss Anthea Tucker
Date Deposited: 02 Sep 2009 13:12
Last Modified: 08 Feb 2013 16:59
Published Version: http://dx.doi.org/10.1016/j.ssc.2009.04.043
Status: Published
Publisher: Elsevier
Refereed: Yes
Identification Number: 10.1016/j.ssc.2009.04.043
URI: http://eprints.whiterose.ac.uk/id/eprint/9277

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