کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1591329 | 1515571 | 2016 | 4 صفحه PDF | دانلود رایگان |
• 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.
Journal: Solid State Communications - Volume 228, February 2016, Pages 6–9