Coherent optical control of the spin of a single hole in a quantum dot

Authors :: Godden, T. M.
Quilter, J. H.
Ramsay, A. J.
Wu, Yanwen
Brereton, P.
Boyle, S. J.
Luxmoore, I. J.
Puebla-Nunez, J.
Fox, A. M.
Skolnick, M. S.
Source :: Phys. Rev. Lett. 108 017402 (2012)
Publication Year :: 2011
Abstract: 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.<br />Comment: 6 pages, 3 figs, include supplement, final version