Spin conductivity of the two-dimensional ferroquadrupolar Heisenberg model. (February 2016)

• Record Type: Journal Article
• Authors: Lima, L.S.
• Is Part Of: Solid state communications. Volume 228(2016)
• Page Start: 6
• Page End: 9
• Publication Date: 2016-02
• Subjects: Solid state chemistry -- Periodicals; Solid state physics -- Periodicals; Chimie de l'état solide -- Périodiques; Physique de l'état solide -- Périodiques; 530.41
• DOI: 10.1016/j.ssc.2015.11.023
• Languages: English
• ISSNs: 0038-1098

Abstract

Abstract: We use the SU(3) Schwinger׳s boson theory to study the spin transport in the S =1 two-dimensional ferroquadrupolar Heisenberg model in the square lattice. We calculate the spin conductivity σ ( ω ) and analyzed the behavior of the AC and DC spin conductivities. The model presents a bilinear and biquadratic exchange interactions. Our results show that the system is an ideal spin conductor for T > 0, because Drude׳s weight D S (which represents the DC conductivity) is non zero for T > 0 and the AC conductivity given by σ reg ( ω ) tends to the infinity when ω → 0 which also correspond to the DC limit. Abstract : Highlights: We employ SU(3) Schwinger boson formalism together with the Kubo formula to calculate the spin conductivity. We find the behavior of AC conductivity σ reg ( ω ) where the region Δ ω where the AC conductivity tends to infinity when ω → 0 . We determine the behavior of the spin stiffness D c with T .