Noninteger-spin magnonic excitations in untextured magnets

Noninteger-spin magnonic excitations in untextured magnets Interactions are responsible for intriguing physics, e.g., the emergence of exotic ground states and excitations, in a wide range of systems. Here, we theoretically demonstrate that dipole-dipole interactions lead to bosonic eigenexcitations with average spin ranging from zero to above ℏ in magnets with uniformly magnetized ground states. These exotic excitations can be interpreted as quantum coherent conglomerates of spin ℏ magnons, the eigenexcitations when the dipolar interactions are disregarded. We further find that the eigenmodes in an easy-axis antiferromagnet are spin-zero quasiparticles instead of the widely believed spin ±ℏ magnons. The latter reemerge when the symmetry is broken by a sufficiently large applied magnetic field. The average spin greater than ℏ is accompanied by vacuum fluctuations and may be considered to be a weak form of frustration. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Noninteger-spin magnonic excitations in untextured magnets

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Noninteger-spin magnonic excitations in untextured magnets

Abstract

Interactions are responsible for intriguing physics, e.g., the emergence of exotic ground states and excitations, in a wide range of systems. Here, we theoretically demonstrate that dipole-dipole interactions lead to bosonic eigenexcitations with average spin ranging from zero to above ℏ in magnets with uniformly magnetized ground states. These exotic excitations can be interpreted as quantum coherent conglomerates of spin ℏ magnons, the eigenexcitations when the dipolar interactions are disregarded. We further find that the eigenmodes in an easy-axis antiferromagnet are spin-zero quasiparticles instead of the widely believed spin ±ℏ magnons. The latter reemerge when the symmetry is broken by a sufficiently large applied magnetic field. The average spin greater than ℏ is accompanied by vacuum fluctuations and may be considered to be a weak form of frustration.
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Publisher
The American Physical Society
Copyright
Copyright © ©2017 American Physical Society
ISSN
1098-0121
eISSN
1550-235X
D.O.I.
10.1103/PhysRevB.96.020411
Publisher site
See Article on Publisher Site

Abstract

Interactions are responsible for intriguing physics, e.g., the emergence of exotic ground states and excitations, in a wide range of systems. Here, we theoretically demonstrate that dipole-dipole interactions lead to bosonic eigenexcitations with average spin ranging from zero to above ℏ in magnets with uniformly magnetized ground states. These exotic excitations can be interpreted as quantum coherent conglomerates of spin ℏ magnons, the eigenexcitations when the dipolar interactions are disregarded. We further find that the eigenmodes in an easy-axis antiferromagnet are spin-zero quasiparticles instead of the widely believed spin ±ℏ magnons. The latter reemerge when the symmetry is broken by a sufficiently large applied magnetic field. The average spin greater than ℏ is accompanied by vacuum fluctuations and may be considered to be a weak form of frustration.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Jul 21, 2017

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