Theory of photoexcited carrier relaxation across the energy gap of phase-ordered materials


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Title:	Theory of photoexcited carrier relaxation across the energy gap of phase-ordered materials
Authors:	Ono, Shota Browse this author
	Shima, Hiroyuki Browse this author →KAKEN DB
	Toda, Yasunori Browse this author →KAKEN DB
Issue Date:	1-Sep-2012
Publisher:	American Physical Society
Journal Title:	Physical Review B
Volume:	86
Issue:	10
Start Page:	104512
Publisher DOI:	10.1103/PhysRevB.86.104512
Abstract:	We develop a theory to describe the energy relaxation of photoexcited carriers in low-temperature ordered states with a band-gap opening. Carrier relaxation time τ near and below transition temperature Tc is 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 the τ divergence near Tc. Remarkable agreements with the theory and experimental data on two different materials which exhibit contrasting τ(T) behaviors are also demonstrated.
Rights:	©2012 American Physical Society
Type:	article
URI:	http://hdl.handle.net/2115/50422
Appears in Collections:	工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 戸田泰則

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