Spin echo of a single electron spin in a quantum dot.
We report a measurement of the spin-echo decay of a single electron spin confined in a semiconductor quantum dot. When we tip the spin in the transverse plane via a magnetic field burst, it dephases in 37 ns due to the Larmor precession around a random effective field from the nuclear spins in the host material. We reverse this dephasing to a large extent via a spin-echo pulse, and find a spin-echo decay time of about 0.5 micros at 70 mT. These results are in the range of theoretical predictions of the electron spin coherence time governed by the electron-nuclear dynamics.
Koppens
F H L
FH
Kavli Institute of NanoScience Delft, Delft, The Netherlands.
Nowack
K C
KC
Vandersypen
L M K
LM