Electrical polarization of nuclear spins in a breakdown regime of quantum Hall effect

TL;DR

This paper presents a method to electrically polarize nuclear spins in quantum Hall systems during breakdown, revealing how nuclear spin polarization influences the breakdown process and electrical properties.

Contribution

The study introduces a novel technique for nuclear spin polarization in quantum Hall systems using breakdown regimes, linking nuclear polarization to QHE breakdown dynamics.

Findings

Nuclear spins can be polarized electrically in QHE systems.

Polarized nuclear spins affect the QHE breakdown process.

Hysteretic voltage-current characteristics are observed due to nuclear polarization.

Abstract

We have developed a method for electrical polarization of nuclear spins in quantum Hall systems. In a breakdown regime of odd-integer quantum Hall effect (QHE), excitation of electrons to the upper Landau subband with opposite spin polarity dynamically polarizes nuclear spins through the hyperfine interaction. The polarized nuclear spins in turn accelerate the QHE breakdown, leading to hysteretic voltage-current characteristics of the quantum Hall conductor.