Single-spin readout in a double quantum dot including a micromagnet.
We use photon-assisted tunneling (PAT) and an inhomogeneous Zeeman field to demonstrate spin-selective PAT readout with a double quantum dot. The inhomogeneous Zeeman field is generated by a proximal micromagnet, which provides different stray fields between the two dots, resulting in an energy difference between the interdot PAT of the up-spin state and that of the down-spin state. We apply various external magnetic fields to modify the relative filling weight between the up-spin and down-spin states and detect it by using a charge detection technique to probe the PAT induced charge delocalization in the double dot.
Shin
Yun-Sok
YS
Quantum Spin Information Project, ICORP, JST, Atsugi-shi, Kanagawa 243-0198, Japan. shin@meso.t.u-tokyo.ac.jp
Obata
Toshiaki
T
Tokura
Yasuhiro
Y
Pioro-Ladrière
Michel
M
Brunner
Roland
R
Kubo
Toshihiro
T
Yoshida
Katsuharu
K
Tarucha
Seigo
S