论文标题
铁pnictides的正常状态的热电子放松：记忆函数方法
Hot electron relaxation in normal state of iron pnictides: memory function approach
论文作者
论文摘要
这项研究导致对非平衡电子弛豫的调查在正常的pnictides中。在这里，我们考虑了电子与铁pnictides的金属状态下的磁子和声子使用记忆函数方法的耦合。在当前模型中，电子的温度高于声子和磁子浴的温度，模仿了非平衡稳态状况。进一步，我们从理论上分析了两个温度模型框架内的广义drude散射率，并研究了它的全频率和温度行为。在零频率状态下，电子磁通散射的速率和电子散射显示出大于Bloch-Grüneisen温度的较高温度值的线性温度依赖性。尽管在较低的温度值时，$ t \llθ_{bg} $，相应的散射速率遵循（$ 1/τ_{e-p} \ varpropto t^3 $）和（$ 1/τ_{e-m} \ varpropto t^{3/2} $）。在交流机制中，我们计算$ 1/τ\ proptoω^2 $ for $ω\llΩ_{bg} $，对于大于bloch-grüneisen频率的值，它是$ω$不依赖的。同样，在较低的频率和零温度限制中，我们已经观察到电子马格诺和电子散射的不同频率尺度，即（$ 1/τ\ proptoω^{3/2} $）和（$ 1/τ\ proptoω^{3} $）。可以通过泵探针实验环境来查看这些结果。
This study leads to the investigation of the non-equilibrium electron relaxation in the normal state of iron pnictides. Here we consider the relaxation of electrons due to their coupling with magnons and phonons in the metallic state of iron pnictides using the memory function approach. In the present model, electrons live at a higher temperature than that of the phonon and magnon baths, mimicking a non-equilibrium steady state situation. Further we analyze theoretically the generalized Drude scattering rate within the framework of Two Temperature Model and study the full frequency and temperature behavior for it. In zero frequency regime, the rate of electron-magnon scattering and electron-phonon scattering shows a linear temperature dependence at higher temperature values greater than Bloch-Grüneisen temperature. Whereas at lower temperature values, $T\llΘ_{BG}$, corresponding scattering rates follow the temperature behavior as ($1/τ_{e-p} \varpropto T^3$) and ($1/τ_{e-m} \varpropto T^{3/2}$), respectively. In the AC regime, we compute that $1/τ\propto ω^2$ for $ω\llω_{BG}$ and for the values greater than the Bloch-Grüneisen frequency, it is $ω$-independent. Also, in lower frequency and zero temperature limit, we have observed the different frequency scale of electron-magnon and electron-phonon scattering i.e ($1/τ\propto ω^{3/2}$) and ($1/τ\propto ω^{3}$). These results can be viewed with the pump-probe experimental setting for the normal state of iron pnictides.
