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

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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:
CreatorsEmailORCIDORCID Put Code
Lohani, VivekUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hickey, CiaranUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Masell, JanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rosch, AchimUNSPECIFIEDorcid.org/0000-0002-6586-5721UNSPECIFIED
URN: urn:nbn:de:hbz:38-123925
DOI: 10.1103/PhysRevX.9.041063
Journal or Publication Title: Phys. Rev. X
Volume: 9
Number: 4
Date: 2019
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 2160-3308
Language: English
Faculty: Faculty of Mathematics and Natural Sciences
Divisions: Faculty of Mathematics and Natural Sciences > Department of Physics > Institute for Theoretical Physics
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
DYNAMICS; MOTION; LATTICEMultiple languages
Physics, MultidisciplinaryMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/12392

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