Electrically tunable hole g factor of an optically active quantum dot for fast spin rotations

Prechtel, Jonathan H. and Maier, Franziska and Houel, Julien and Kuhlmann, Andreas V. and Ludwig, Arne and Wieck, Andreas D. and Loss, Daniel and Warburton, Richard J.. (2015) Electrically tunable hole g factor of an optically active quantum dot for fast spin rotations. Physical Review B, 91 (16). p. 165304.

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We report a large g factor tunability of a single hole spin in an InGaAs quantum dot via an electric field. The magnetic field lies in the in-plane direction x, the direction required for a coherent hole spin. The electrical field lies along the growth direction z and is changed over a large range, 100 kV/cm. Both electron and hole g factors are determined by high resolution laser spectroscopy with resonance fluorescence detection. This, along with the low electrical-noise environment, gives very high quality experimental results. The hole g factor g(h)(x) depends linearly on the electric field F-z, dg(h)(x)/dF(z) = (8.3 +/- 1.2) x 10(-4) cm/kV, whereas the electron g factor g(e)(x) is independent of electric field dg(e)(x)/dF(z) = (0.1 +/- 0.3) x 10(-4) cm/kV (results averaged over a number of quantum dots). The dependence of g(h)(x) on F-z is well reproduced by a 4 x 4 k . p model demonstrating that the electric field sensitivity arises from a combination of soft hole confining potential, an In concentration gradient, and a strong dependence of material parameters on In concentration. The electric field sensitivity of the hole spin can be exploited for electrically driven hole spin rotations via the g tensor modulation technique and based on these results, a hole spin coupling as large as similar to 1 GHz can be envisaged.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimental Physics (Warburton)
05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Mesoscopics (Loss)
UniBasel Contributors:Warburton, Richard J and Loss, Daniel
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:10 May 2017 10:43
Deposited On:09 Feb 2016 09:32

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