Internal Excitations and Dissipative Damping of Quantum Hall Skyrmions

TL;DR

This paper introduces a maximum speed limit for Skyrmion drift in quantum Hall systems, beyond which internal excitations enable spin-wave radiation, with calculations supporting this phenomenon.

Contribution

It proposes an intrinsic speed limit for Skyrmion drift and demonstrates how exceeding this speed induces internal excitations and spin-wave radiation.

Findings

Skyrmions can radiate spin-waves when exceeding a certain drift speed.

Internal excitations enable total spin conservation during radiation.

Time-dependent Hartree-Fock calculations support the proposed mechanism.

Abstract

We propose an intrinsic maximum speed for dissipationless E cross B drift of Skyrmion quasiparticles in quantum Hall ferromagnets. When this speed is exceeded, Skyrmions can radiate spin-waves by making internal excitations which allow total spin to be conserved. Our proposal is illustrated by a time-dependent Hartree-Fock approximation calculation of the excitation spectrum for a Skyrmion bound to an impurity.