Theory of photoexcited carrier relaxation across the energy gap of phase ordered materials
Theory of photoexcited carrier relaxation across the energy gap of phase ordered materials
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相序材料能隙上的光激发载流子弛豫理论
DOI：
10.1103/physrevb.86.104512
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
and Yasunori Toda
中科院分区：
文献类型：
--
作者：
Shota Ono;Hiroyuki Shim a;and Yasunori Toda
我们发展了一个理论来描述光激发载流子在低温有序态下的能量弛豫。通过考察不同的载流子-声子散射对弛豫速率的贡献，给出了在转变温度附近和以下的载流子弛豫时间。横向声学声子模在载流子弛豫中起着至关重要的作用，它们的热容决定了附近的发散度。还证明了与表现出对比行为的两种不同材料的理论和实验数据的显着一致。
We develop a theory to describe the energy relaxation of photoexcited carriers in low-temperature ordered states with a band-gap opening. Carrier relaxation timenear and below transition temperatureis formulated by examining the contributions from different carrier-phonon scatterings to the relaxation rate. Transverse acoustic phonon modes are found to play a crucial role in carrier relaxation; their heat capacity determines thedivergence near. Remarkable agreements with the theory and experimental data on two different materials which exhibit contrastingbehaviors are also demonstrated.