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Coherent manipulation of nuclear spins in the breakdown regime of integer quantum Hall states

Research paper by Minoru Kawamura, Hiroyuki Takahashi, Yoshiaki Hashimoto, Shingo Katsumoto, Tomoki Machida

Indexed on: 29 Aug '08Published on: 29 Aug '08Published in: Physics - Mesoscopic Systems and Quantum Hall Effect



Abstract

We demonstrate a new method for electrical manipulation of nuclear spins utilizing dynamic nuclear polarization induced by quantum Hall effect breakdown. Nuclear spins are polarized and detected through the hyperfine interaction between a nuclear spin system and a two-dimensional electron system located at an interface of GaAs/AlGaAs single heterostructure. Coherent oscillations between the nuclear-spin quantum states are observed by measuring the longitudinal voltage of the conductor.