Triangular-lattice antiferromagnet from a bosonic spinon perspective

A. MEZIO; C. N. SPOSETTI; L.O. MANUEL; A. E. TRUMPER

Trieste

Workshop; Inovations in Strongly Correlated Electronic Systems: School and Workshop; 2012

The Abdus Salam Centre For Theoretical Physics

We investigate the triangular-lattice antiferromagnet from a bosonic spinon perspective based on the Schwinger spin- 1/2 boson theory.1 We use a mean eld scheme decoupling that reproduces quantitatively the zero temperature energy spectrum derived previously using series expansions. By analyzing the spin-spin and the boson density-density dynamical structure factors we identify the unphysical spin excitations that come from the relaxation of the local constraint on bosons. This allows us to reconstruct a free energy based on the physical excitations only, whose predictions for entropy and uniform susceptibility seem to be reliable within the temperature range 0