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

François Fras (1) , Benoit Eble (1) , Bruno Siarry (1) , Frédéric Bernardot (1) , Audrey Miard (2) , Aristide Lemaître (2) , Christophe Testelin (1) , Maria Chamarro (1)

1 INSP - Institut des Nanosciences de Paris
2 LPN - Laboratoire de photonique et de nanostructures

In this study, we evidence hole spin mode locking in a largely inhomogeneous p-doped InAs quantum dot (QD) ensemble, Δgxh/gxh≈34%, which allows us to reveal a long spin coherence time of T2h≈0.8μs. 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.

Mots clés: Quantum dots; hole spin; coherence time; Landé factor; mode locking; optical orientation; Voigt geometry

Domaines: Physique Quantique [quant-ph]

François Fras, Benoit Eble, Bruno Siarry, Frédéric Bernardot, Audrey Miard, et al.. Hole spin mode locking and coherent dynamics in a largely inhomogeneous ensemble of p-doped InAs quantum dots. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2012, 86, pp.161303. ⟨10.1103/PHYSREVB.86.161303⟩. ⟨hal-00913486⟩