How to detect weak emergent broken-symmetries of the Kagome antiferromagnet from Raman spectroscopy

Details How to detect weak emergent broken-symmetries of the Kagome antiferromagnet from Raman spectroscopy How to detect weak emergent broken-symmetries of the Kagome antiferromagnet from Raman spectroscopy

2008-01-23

arxiv.org/abs/0801.3532v2

Phys. Rev. B 77, 172406 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures, v2. intro partially rewritten

Scientific paper

10.1103/PhysRevB.77.172406

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 to detect weak broken symmetries and emergent order-parameters. We focus on the Kagome antiferromagnet where 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 (VBC) using a random phase approximation.

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