带隙系统载流子弛豫反常的统一解释
Unifying explanation for carrier relaxation anomaly in gapped systems
摘要：
我们发展了一个理论来描述光激发载流子在低温有序态的带隙开放的能量弛豫和制定载流子弛豫时间$τ$附近和低于转变温度$T_{\mathrm{c}}$量化的贡献从不同的载流子声子散射的弛豫率。该理论解释了$τ$在带隙系统中的反常实验观察。横向声学（TA）声子模式在载流子弛豫中起着至关重要的作用;它们的热容决定了$T_{\mathrm{c}}$附近的$τ$ -发散。通过将富勒烯聚合物的$τ$拟合到理论曲线上来验证该理论。
英文摘要：
We develop a theory to describe energy relaxation of photo-excited carriers in low-temperature ordered states with band gap opening and formulate carrier relaxation time $τ$ near and below transition temperature $T_{\mathrm{c}}$ by quantifying contributions from different carrier-phonon scatterings to the relaxation rate. The theory explains anomalous experimental observations of $τ$ in gapped systems. Transverse acoustic (TA) phonon modes play a crucial role in carrier relaxation; their heat capacity determines $τ$-divergence near $T_{\mathrm{c}}$. The theory is validated by fitting $τ$ of fullerene polymers onto a theoretical curve.
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