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

TL;DR

This paper demonstrates electrical coherent control of nuclear spins in a quantum Hall system using a breakdown regime to induce dynamic polarization and observe Rabi oscillations via voltage measurements.

Contribution

It introduces a method to electrically manipulate nuclear spins in a quantum Hall system through a breakdown regime, enabling coherent control and detection.

Findings

Nuclear spins can be dynamically polarized using quantum Hall breakdown.

Rabi oscillations of nuclear spins are observed via voltage measurements.

Electrical control of nuclear spins is achieved in a semiconductor heterostructure.

Abstract

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.