Hole Spin Pumping and Re-pumping in a p-type {\delta}-doped InAs Quantum   Dot
  We have grown high quality p-type {\delta}-doped InAs quantum dots and have demonstrated coherent spin pumping and repumping of a hole spin in a positively charged quantum dot by means of a single-laser driving scheme under a high magnetic field in the Voigt configuration. Modeling of our system shows excellent qualitative agreement with the experimental findings and further explores the performance of the single-laser scheme for spin pumping and re-pumping. 
Konstantinos G. Lagoudakis, Kevin A. Fischer, Tomas Sarmiento, Kai   Mueller and Jelena Vu\v{c}kovi\'c
quant-ph cond-mat.mes-hall