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

Preview Only

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.
Loading next page...
 
/lp/aps_physical/noninteger-spin-magnonic-excitations-in-untextured-magnets-I0eu0cLumR
Publisher
American Physical Society (APS)
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

There are no references for this article.

Sorry, we don’t have permission to share this article on DeepDyve,
but here are related articles that you can start reading right now:

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off