Electrically tunable g factors in quantum dot molecular spin states.
We present a magnetophotoluminescence study of individual vertically stacked InAs/GaAs quantum dot pairs separated by thin tunnel barriers. As an applied electric field tunes the relative energies of the two dots, we observe a strong resonant increase or decrease in the g factors of different spin states that have molecular wave functions distributed over both quantum dots. We propose a phenomenological model for the change in g factor based on resonant changes in the amplitude of the wave function in the barrier due to the formation of bonding and antibonding orbitals.
Doty
M F
MF
Naval Research Laboratory, Washington, D.C. 20375, USA. doty@bloch.nrl.navy.mil
Scheibner
M
M
Ponomarev
I V
IV
Stinaff
E A
EA
Bracker
A S
AS
Korenev
V L
VL
Reinecke
T L
TL
Gammon
D
D