Anomalous spin-wave excitations in a one-dimensional Dzyaloshinski--Moriya antiferromagnet

Journal Article · Tue May 01 04:00:00 EDT 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.345856· OSTI ID:7186344

Xia, Q; Riseborough, P S ^[1]

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1. Physics Department, Polytechnic University, 333 Jay Street, Brooklyn, New York 11201 (USA)

The dynamics of a one-dimensional Heisenberg antiferromagnet with a small Dzyaloshinski--Moriya component to the exchange interaction is considered. The spin rotational invariance within the easy plane is broken by the application of a weak magnetic field in the easy plane. The nature of the spin-wave excitations of the quantum spin system is investigated, and pronounced anomalies in the single-spin-wave spectrum at fields comparable to the anisotropy in the exchange interaction are found. These anomalies are of quantum character and are related to the resonance between the single-spin-wave and the two-spin-wave excitations. The implications for the two-spin-wave bound states are discussed.

• DOE Contract Number: FG02-84ER45127
• OSTI ID: 7186344
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 67:9; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

656002* -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANGULAR MOMENTUM
ANTIFERROMAGNETIC MATERIALS
CRYSTAL MODELS
DYNAMICS
EXCHANGE INTERACTIONS
HEISENBERG MODEL
INTERACTIONS
INVARIANCE PRINCIPLES
MAGNETIC FIELDS
MAGNETIC MATERIALS
MATERIALS
MATHEMATICAL MODELS
MECHANICS
ONE-DIMENSIONAL CALCULATIONS
PARTICLE PROPERTIES
SPIN
SPIN WAVES