Phys. Rev. B 77, 172406 (2008) [4 pages]Detection of weak emergent broken-symmetries of the kagome antiferromagnet by Raman spectroscopyReceived 1 February 2008; revised 4 April 2008; published 16 May 2008 We show that the magnetic Raman response of a spin liquid is independent of the polarizations of the light for triangular symmetries. In contrast, a ground state that has a broken-symmetry shows characteristic oscillations when the polarizations are rotated. This would allow one to detect weak broken-symmetries and emergent order parameters. We focus on the kagome antiferromagnet wherein no conventional long-range order has been found so far and present the Raman cross section of a spin liquid and a valence bond crystal by using a random phase approximation. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.77.172406
DOI:
10.1103/PhysRevB.77.172406
PACS:
75.10.Jm, 75.40.Gb
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