Hole spin mode locking and coherent dynamics in a largely inhomogeneous ensemble ofp-doped InAs quantum dots

Abstract

In this study, we evidence hole spin mode locking in a largely inhomogeneous $p$-doped InAs quantum dot (QD) ensemble, $\ensuremath{\Delta}{g}_{x}^{h}/{g}_{x}^{h}\ensuremath{\approx}34%$, which allows us to reveal a long spin coherence time of ${T}_{2}^{h}\ensuremath{\approx}0.8\phantom{\rule{0.28em}{0ex}}\ensuremath{\mu}\mathrm{s}$. In addition, with a two-pump experiment, we demonstrate, in a low magnetic range 60--120 mT, the possibility to synchronize and tune a single subset of QDs through the distribution. Experiments are supported by an analysis within the density matrix approach.