title: Single-spin readout in a double quantum dot including a micromagnet.
abstract: 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.
authors.affiliation: Quantum Spin Information Project, ICORP, JST, Atsugi-shi, Kanagawa 243-0198, Japan. shin@meso.t.u-tokyo.ac.jp
authors.forename: Yun-Sok
authors.initials: YS
authors.lastname: Shin
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Obata
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Tokura
authors.forename: Michel
authors.initials: M
authors.lastname: Pioro-Ladrière
authors.forename: Roland
authors.initials: R
authors.lastname: Brunner
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Kubo
authors.forename: Katsuharu
authors.initials: K
authors.lastname: Yoshida
authors.forename: Seigo
authors.initials: S
authors.lastname: Tarucha