| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1591329 | Solid State Communications | 2016 | 4 Pages |
•We employ SU(3) Schwinger boson formalism together with the Kubo formula to calculate the spin conductivity.•We find the behavior of AC conductivity σreg(ω)σreg(ω) where the region ΔωΔω where the AC conductivity tends to infinity when ω→0ω→0.•We determine the behavior of the spin stiffness Dc with T.
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)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>0T>0, because Drude׳s weight DS (which represents the DC conductivity) is non zero for T>0T>0 and the AC conductivity given by σreg(ω)σreg(ω) tends to the infinity when ω→0ω→0 which also correspond to the DC limit.
