Quantum Skyrmions in Frustrated Ferromagnets - Kölner UniversitätsPublikationsServer

Lohani, Vivek, Hickey, Ciaran, Masell, Jan and Rosch, Achim ORCID: 0000-0002-6586-5721 (2019). Quantum Skyrmions in Frustrated Ferromagnets. Phys. Rev. X, 9 (4). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2160-3308

Full text not available from this repository.

DOI:10.1103/PhysRevX.9.041063

Abstract

We develop a quantum theory of magnetic skyrmions and antiskyrmions in a spin-1/2 Heisenberg magnet with frustrating next-nearest-neighbor interactions. Using exact diagonalization we show numerically that a quantum skyrmion exists as a stable many-magnon bound state and investigate its quantum numbers. We then derive a phenomenological Schrodinger equation for the quantum skyrmion and its internal degrees of freedom. We find that quantum skyrmions have highly unusual properties. Their bandwidth is exponentially small and arises from tunneling processes between skyrmion and antiskyrmion. The band structure changes both qualitatively and quantitatively when a single spin is added or removed from the quantum skyrmion, reflecting a locking of angular momentum and spin quantum numbers characteristic for skyrmions. Additionally, while for weak forces the quantum skyrmion is accelerated parallel to the force, it moves in a perpendicular direction for stronger fields.

Item Type:

Journal Article

Creators:

Creators	Email	ORCID	ORCID Put Code
Lohani, Vivek	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Hickey, Ciaran	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Masell, Jan	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Rosch, Achim	UNSPECIFIED	orcid.org/0000-0002-6586-5721	UNSPECIFIED