Fermionic spin excitations in two and three-dimensional antiferromagnets

Details Fermionic spin excitations in two and three-dimensional antiferromagnets Fermionic spin excitations in two and three-dimensional antiferromagnets

2009-02-02

arxiv.org/abs/0902.0378v4

Phys. Rev. Lett. 103, 187203 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, accepted version of the manuscript

Scientific paper

10.1103/PhysRevLett.103.187203

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 kagome 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 $0.06 J$.

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