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

TL;DR

This paper presents a novel electrical technique to coherently manipulate and detect nuclear spins in a quantum Hall system using hyperfine interactions and quantum Hall effect breakdown.

Contribution

It introduces a new method for nuclear spin control via quantum Hall effect breakdown, enabling coherent manipulation and detection in a GaAs/AlGaAs heterostructure.

Findings

Nuclear spins can be polarized and detected electrically.

Coherent oscillations between nuclear-spin states are observed.

The method leverages hyperfine interaction during quantum Hall breakdown.

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.