Raman scattering for triangular lattices spin-1/2 Heisenberg antiferromagnets

Abstract

Motivated by various spin-1/2 compounds like Cs${}_2$CuCl${}_4$ or $\kappa$-(BEDT-TTF)${}_2$Cu${}_2$(CN)${}_3$, we derive a Raman-scattering operator {\it à la} Shastry and Shraiman for various geometries. For T=0, the exact spectra is computed by Lanczos algorithm for finite-size clusters. We perform a systematic investigation as a function of $J_2/J_1$, the exchange constant ratio: ranging from $J_2=0$, the well known square-lattice case, to $J_2/J_1=1$ the isotropic triangular lattice. We discuss the polarization dependence of the spectra and show how it can be used to detect precursors of the instabilities of the ground state against quantum fluctuations.

To appear in J. of Phys. Condens. Matter (Proceedings of International Conference "Highly Frustrated Magnets", Osaka (Japan), August 2006). 6 pages, 2 figures

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• Anomalous Excitation Spectra of Frustrated Quantum Antiferromagnets
• Low-lying quasiparticle states and hidden collective charge instabilities in parent cobaltate superconductors (NaxCoO2)
• Anomalous electronic Raman scattering in Na_xCoO_2 H_2O

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