Fermionic spin excitations in two- and three-dimensional antiferromagnets

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Title: Fermionic spin excitations in two- and three-dimensional antiferromagnets
Author: Zhihao, Hao; Tchernyshyov, O.
Abstract: Spin excitations in an ordered Heisenberg magnet are magnons-bosons with spin 1. That may change when frustration and quantum fluctuations suppress the order and restore the spin-rotation symmetry. We show that spin excitations in the S = 1/2 Heisenberg antiferromagnet on a kagome lattice are spinons-fermions with spin 1/2. In the ground state the system can be described as a collection of small, heavy pairs of spinons with spin 0. A magnetic excitation of lowest energy amounts to breaking up a pair into two spinons at a cost of 0.06 J.
URI: http://jhir.library.jhu.edu/handle/1774.2/33764
Date: 2009-10-30
Citation: Physical Review Letters 30 Oct. 2009, vol.103, no.18, 187203 (4 pp.)
Subject: ordered Heisenberg magnet
2D antiferromagnets
spin fluctuations
quantum fluctuations
spin-rotation symmetry
fermion systems
antiferromagnetic materials
Heisenberg antiferromagnet
Kagome lattices
ground states
magnetic excitations

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