Journal
PHYSICAL REVIEW LETTERS
Volume 103, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.187203
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Funding
- U.S. DOE [DE-FG02-08ER46544]
- U.S. Department of Energy (DOE) [DE-FG02-08ER46544] Funding Source: U.S. Department of Energy (DOE)
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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.
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