%0 Journal Article
%T Unifying explanation for carrier relaxation anomaly in gapped systems
%A Shota Ono
%A Hiroyuki Shima
%A Yasunori Toda
%J Physics
%D 2012
%I arXiv
%X 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 $\tau$ 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 $\tau$ in gapped systems. Transverse acoustic (TA) phonon modes play a crucial role in carrier relaxation; their heat capacity determines $\tau$-divergence near $T_{\mathrm{c}}$. The theory is validated by fitting $\tau$ of fullerene polymers onto a theoretical curve.
%U http://arxiv.org/abs/1202.2635v1