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

Inah Yeo (1) , Nitin S. Malik (2) , Mathieu Munsch (2) , Emmanuel Dupuy (2) , Joël Bleuse (2) , Yann-Michel Niquet (2) , Jean-Michel Gérard (2) , Julien Claudon (2) , Edouard Wagner (3) , Signe Seidelin (4) , Alexia Auffèves (1) , Jean-Philippe Poizat (1) , Gilles Nogues (1)

1 NEEL - NPSC - Nanophysique et Semiconducteurs
2 INAC - Institut Nanosciences et Cryogénie
3 NEEL - AUTOCARAC - Automatisation & caractérisation
4 NEEL - NOF - Nano-Optique et Forces

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.

Mots clés: indium compounds; III-V semiconductors; nanowires; semiconductor quantum dots; gallium arsenide; surface charging

Domaines: Autre [cond-mat.other]; Physique Quantique [quant-ph]

Inah Yeo, Nitin S. Malik, Mathieu Munsch, Emmanuel Dupuy, Joël Bleuse, et al.. Surface effects in a semiconductor photonic nanowire and spectral stability of an embedded single quantum dot. Applied Physics Letters, 2011, 99, pp.233106. ⟨10.1063/1.3665629⟩. ⟨hal-00652681⟩