2011/06/30 by T. M. Godden, J. H. Quilter, A. J. Ramsay +7
Physics and Astronomy · #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevlett.108.017402
published as Phys. Rev. Lett. 108 017402 (2012) · 6 pages, 3 figs, include supplement, final version
arxiv created 2012/01/06 · arxiv updated 2012/01/09
We demonstrate coherent optical control of a single hole spin confined to an InAs/GaAs quantum dot. A superposition of hole spin states is created by fast (10-100 ps) dissociation of a spin-polarized electron-hole pair. Full control of the hole-spin is achieved by combining coherent rotations about two axes: Larmor precession of the hole-spin about an external Voigt geometry magnetic field, and rotation about the optical-axis due to the geometric phase shift induced by a picosecond laser pulse resonant with the hole-trion transition.