Controlling the polarization eigenstate of a quantum dot exciton with light.
We demonstrate optical control of the polarization eigenstates of a neutral quantum dot exciton without any external fields. By varying the excitation power of a circularly polarized laser in microphotoluminescence experiments on individual InGaAs quantum dots we control the magnitude and direction of an effective internal magnetic field created via optical pumping of nuclear spins. The adjustable nuclear magnetic field allows us to tune the linear and circular polarization degree of the neutral exciton emission. The quantum dot can thus act as a tunable light polarization converter.
Université de Toulouse, INSA-CNRS-UPS, LPCNO, 135 Av. Rangueil, 31077 Toulouse, France.
Thomas
T
Belhadj
Claire-Marie
CM
Simon
Thierry
T
Amand
Pierre
P
Renucci
Beatrice
B
Chatel
Olivier
O
Krebs
Aristide
A
Lemaître
Paul
P
Voisin
Xavier
X
Marie
Bernhard
B
Urbaszek