title: Optical pump-probe measurements of local nuclear spin coherence in semiconductor quantum wells.
abstract: We demonstrate local manipulation and detection of nuclear spin coherence in semiconductor quantum wells by an optical pump-probe technique combined with pulse rf NMR. The Larmor precession of photoexcited electron spins is monitored by time-resolved Kerr rotation (TRKR) as a measure of nuclear magnetic field. Under the irradiation of resonant pulsed rf magnetic fields, Rabi oscillations of nuclear spins are traced by TRKR signals. The intrinsic coherence time evaluated by a spin-echo technique reveals the dependence on the orientation of the magnetic field with respect to the crystalline axis as expected by the nearest neighbor dipole-dipole interaction.
authors.affiliation: Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Sanada
authors.forename: Y
authors.initials: Y
authors.lastname: Kondo
authors.forename: S
authors.initials: S
authors.lastname: Matsuzaka
authors.forename: K
authors.initials: K
authors.lastname: Morita
authors.forename: C Y
authors.initials: CY
authors.lastname: Hu
authors.forename: Y
authors.initials: Y
authors.lastname: Ohno
authors.forename: H
authors.initials: H
authors.lastname: Ohno