Different from this prediction, we find that the extrema in the T 1 do not occur when the magnetic field is along the ¯ crystallographic directions. This periodicity has been predicted for circular dots as being due to the interplay of Rashba and Dresselhaus spin orbit contributions. Kavli Institute of Nanoscience, TU Delft, LorentzCJ Delft, Netherlands 2 RIKEN Center for Emergent Matter Science, Wako-shi, Saitama 351-0198, Japan 3 Institute of Physics, Slovak Academy of Sciences, Dubravska cesta 9, 84511 Bratislava, Slovakia 4 Solid State Physics Laboratory, ETH Zurich, SchafmattstraZurich, Switzerland (Received 2 September 2014 published 19 December 2014) We report that the electron spin-relaxation time T 1 in a GaAs quantum dot with a spin-1=2 ground state has a 180° periodicity in the orientation of the in-plane magnetic field. Spin-Relaxation Anisotropy in a GaAs Quantum Dot P.
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