Abstract
We investigate the excitation spectrum and spin conductivity in square lattice antiferromagnets by nonlinear spin-wave theory. We have found that the excitation spectrum have a rotonlike minimum at about 3/4 of the saturation field. The «roton» appears and softens rapidly to zero as a function of the magnetic field as a result of the especially strong three-magnon interactions. For the spin conductivity, it becomes clear that a two-magnon sideband appears for sufficiently strong three-magnon interactions.
| Original language | English |
|---|---|
| Article number | 012116 |
| Journal | Journal of Physics: Conference Series |
| Volume | 592 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2014 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Rotons and spin transport in square lattice antiferromagnets in magnetic fields. / Kubo, Yurika; Kurihara, Susumu.
In: Journal of Physics: Conference Series, Vol. 592, No. 1, 012116, 2014.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Rotons and spin transport in square lattice antiferromagnets in magnetic fields
AU - Kubo, Yurika
AU - Kurihara, Susumu
PY - 2014
Y1 - 2014
N2 - We investigate the excitation spectrum and spin conductivity in square lattice antiferromagnets by nonlinear spin-wave theory. We have found that the excitation spectrum have a rotonlike minimum at about 3/4 of the saturation field. The «roton» appears and softens rapidly to zero as a function of the magnetic field as a result of the especially strong three-magnon interactions. For the spin conductivity, it becomes clear that a two-magnon sideband appears for sufficiently strong three-magnon interactions.
AB - We investigate the excitation spectrum and spin conductivity in square lattice antiferromagnets by nonlinear spin-wave theory. We have found that the excitation spectrum have a rotonlike minimum at about 3/4 of the saturation field. The «roton» appears and softens rapidly to zero as a function of the magnetic field as a result of the especially strong three-magnon interactions. For the spin conductivity, it becomes clear that a two-magnon sideband appears for sufficiently strong three-magnon interactions.
UR - http://www.scopus.com/inward/record.url?scp=84925339393&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84925339393&partnerID=8YFLogxK
U2 - 10.1088/1742-6596/592/1/012116
DO - 10.1088/1742-6596/592/1/012116
M3 - Article
AN - SCOPUS:84925339393
VL - 592
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - 1
M1 - 012116
ER -