论文标题
挫败感对光激发晶格系统非平衡动力学的影响
Effects of frustration on the nonequilibrium dynamics of photo-excited lattice systems
论文作者
论文摘要
从理论上讲，我们研究了晶格几何形状对在半填充的二维Hubbard模型中光激发载体非平衡动力学的影响。利用动态簇近似的非平衡概括，我们比较了晶格中的弛豫动力学，这些动力学在三角形晶格和方格构型之间插值，因此揭示了几何挫败感在这些密切相关的非平衡系统中的作用。特别是，我们表明，由于挫败感，旋转背景无序引起的冷却效果在三角形的情况下不太有效。这表现在光掺杂人群的较长放松时间中，通过时间分辨的光发射信号来衡量，以及在带有连字母内部的带有稳态后，在非热稳态下光掺杂的载体的有效温度更高。
We theoretically investigate the effects of the lattice geometry on the nonequilibrium dynamics of photo-excited carriers in a half-filled two-dimensional Hubbard model. Using a nonequilibrium generalization of the dynamical cluster approximation, we compare the relaxation dynamics in lattices which interpolate between the triangular lattice and square lattice configuration and thus reveal the role of the geometric frustration in these strongly correlated nonequilibrium systems. In particular, we show that the cooling effect resulting from the disordering of the spin background is less effective in the triangular case because of the frustration. This manifests itself in a longer relaxation time of the photo-doped population, as measured by the time-resolved photo-emission signal, and a higher effective temperature of the photo-doped carriers in the non-thermal steady state after the intra-Hubbard-band thermalization.
