Surface effects in a semiconductor photonic nanowire and spectral stability of an embedded single quantum dot

Details Surface effects in a semiconductor photonic nanowire and spectral stability of an embedded single quantum dot Surface effects in a semiconductor photonic nanowire and spectral stability of an embedded single quantum dot

2011-12-16

arxiv.org/abs/1112.3733v1

Applied Physics Letters 99 (2011) 233106

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1063/1.3665629

We evidence the influence of surface effects for InAs quantum dots embedded into GaAs photonic nanowires used as efficient single photon sources. We observe a continuous temporal drift of the emission energy that is an obstacle to resonant quantum optics experiments at the single photon level. We attribute the drift to the sticking of oxygen molecules onto the wire, which modifies the surface charge and hence the electric field seen by the quantum dot. The influence of temperature and excitation laser power on this phenomenon is studied. Most importantly, we demonstrate a proper treatment of the nanowire surface to suppress the drift.

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