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

Autor:	Cepas, O., Haerter, J. O., Lhuillier, C.
Rok vydání:	2008
Předmět:	Condensed Matter - Strongly Correlated Electrons
Zdroj:	Phys. Rev. B 77, 172406 (2008)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.77.172406
Popis:	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. Comment: 4 pages, 2 figures, v2. intro partially rewritten
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0801.3532 Zobrazit plný text záznamu View this record from Arxiv