Strain-induced enhancement of electric quadrupole splitting in resistively detected nuclear magnetic resonance spectrum in quantum Hall systems

TL;DR

This study demonstrates electrical control of nuclear spin states in a quantum Hall system by enhancing quadrupole splitting through external stress, enabling clear NMR spectra and Rabi oscillations.

Contribution

It introduces a method to enhance quadrupole splitting in nuclear spins via strain, facilitating improved nuclear magnetic resonance manipulation in quantum Hall systems.

Findings

Enhanced quadrupole splitting observed with external stress.

Clear triple-peak NMR spectra obtained.

Rabi oscillations demonstrated between nuclear spin levels.

Abstract

We show electrical coherent manipulation of quadrupole-split nuclear spin states in a GaAs/AlGaAs heterostructure on the basis of the breakdown of quantum Hall effect. The electric quadrupole splitting in nuclear spin energy levels is intentionally enhanced by applying an external stress to the heterostructure. Nuclear magnetic resonance spectra with clearly separated triple peaks are obtained, and Rabi oscillations are observed between the nuclear spin energy levels. The decay of the spin-echo signal is compared between the cases before and after the enhancement of quadrupole splitting.