Universität zu Köln

Psaroudaki, Christina ORCID: 0000-0002-7073-6422 and Panagopoulos, Christos ORCID: 0000-0003-4692-3233 (2022). Skyrmion helicity: Quantization and quantum tunneling effects. Phys. Rev. B, 106 (10). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

We derive the quantization of magnetic helicity in the solid state, and we demonstrate tunable macroscopic quantum tunneling, coherence, and oscillation for a skyrmion spin texture stabilized in frustrated magnets. We also discuss the parameter space for the experimental realization of quantum effects. Typically, for a skyrmion of 5 nm radius, quantum tunneling between two macroscopic states with distinct helicities occurs with an inverse escape rate within seconds below 100 mK, and an energy splitting in the MHz regime. The feasibility of quantum tunneling of an ensemble of magnetic spins inspires new platforms for quantum operations utilizing topologically protected chiral spin configurations.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Psaroudaki, Christina UNSPECIFIED orcid.org/0000-0002-7073-6422 UNSPECIFIED Panagopoulos, Christos UNSPECIFIED orcid.org/0000-0003-4692-3233 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-668720
DOI:	10.1103/PhysRevB.106.104422
Journal or Publication Title:	Phys. Rev. B
Volume:	106
Number:	10
Date:	2022
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ZERO-VOLTAGE STATE; PHASE INTERFERENCE; INDIVIDUAL ATOMS; MAGNETIZATION; RESONANCE; SYSTEMS; RELAXATION; SCATTERING; DYNAMICS; FIELD Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/66872