Quantum fluctuations in the order parameter of quantum skyrmion crystals

TL;DR

This paper investigates quantum fluctuations in dense skyrmion crystal ground states, demonstrating that a discretized order parameter effectively indicates quantum skyrmions and captures phase transitions between skyrmion phases.

Contribution

It introduces a discretized order parameter for quantum skyrmions and shows its effectiveness in identifying quantum phases and transitions in skyrmion crystals.

Findings

Discretized order parameter signals quantum skyrmions.

Quantum phase transition between skyrmion phases identified.

Quantum fluctuations significantly affect small skyrmions.

Abstract

Traditionally, skyrmions are treated as continuum magnetic textures of classical spins with a well-defined topological skyrmion number. Owing to their topological protection, skyrmions have attracted great interest as building blocks in future memory technology. Smaller skyrmions offer greater memory density, however, quantum effects are not negligible for skyrmions with sizes of just a few lattice constants. In this paper we study quantum fluctuations around dense skyrmion crystal ground states, and focus on the utility of a discretized order parameter for quantum skyrmions. The order parameter is found to be a useful indicator of the existence of quantum skyrmions, and captures the quantum phase transition between two distinct skyrmion phases.