title: Single-shot detection of electrons generated by individual photons in a tunable lateral quantum dot.
abstract: We demonstrate single-shot detection of single electrons generated by single photons using an electrically tunable quantum dot and a quantum point contact charge detector. By tuning the quantum dot in a Coulomb blockade before the photoexcitation, we observe the trapping and subsequent resetting of single photogenerated electrons. The photogenerated electrons can be stored in the dot for a tunable time range from shorter to longer than the spin-flip time T1. We combine this trap-reset technique with spin-dependent tunneling under magnetic fields to observe the spin-dependent photon detection within the T1.
authors.affiliation: Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Pioda
authors.forename: E
authors.initials: E
authors.lastname: Totoki
authors.forename: H
authors.initials: H
authors.lastname: Kiyama
authors.forename: T
authors.initials: T
authors.lastname: Fujita
authors.forename: G
authors.initials: G
authors.lastname: Allison
authors.forename: T
authors.initials: T
authors.lastname: Asayama
authors.forename: A
authors.initials: A
authors.lastname: Oiwa
authors.forename: S
authors.initials: S
authors.lastname: Tarucha