Electrical coherent control of nuclear spins in a breakdown regime of quantum Hall effect

H. Takahashi, M. Kawamura, S. Masubuchi, K. Hamaya, T. Machida, Y. Hashimoto, S. Katsumoto

Published 2007-05-24, updated 2007-09-27Version 3

Using a conventional Hall-bar geometry with a micro-metal strip on top of the surface, we demonstrate an electrical coherent control of nuclear spins in an AlGaAs/GaAs semiconductor heterostructure. A breakdown of integer quantum Hall (QH) effect is utilized to dynamically polarize nuclear spins. By applying a pulse rf magnetic field with the metal strip, the quantum state of the nuclear spins shows Rabi oscillations, which is detected by measuring longitudinal voltage of the QH conductor.