Gigahertz longitudinal acoustic phonons originating from ultrafast ligand field transitions in hematite thin films

doi:10.1088/1674-1056/23/4/044206

Abstract The creation and propagation of longitudinal acoustic phonons (LAPs) in high quality hematite thin films (α-Fe₂O₃) epitaxially grown on different substrates (BaTiO₃, SrTiO₃, and LaAlO₃) are investigated using the femtosecond pump-probe technique. Transient reflection measurements (ΔR/R) indicate the photo-excited electron dynamics, and the initial decay less than 1 ps and the slow decay of ～ 500 ps are attributed to the electron-LO phonon coupling and electron-hole nonradiative recombination, respectively. LAPs in α-Fe₂O₃ film can be created by ultrafast excitation of the ligand field state, such as the ligand field transitions under 800-nm excitation as well as the ligand to metal charge-transfer with 400-nm excitation. The strain modulations of the sound velocity and the out-of-plane elastic properties are demonstrated in α-Fe₂O₃ film on different substrates.

Keywords: α-Fe₂O₃ pump-probe technique acoustic phonons ligand field

Received: 12 June 2013
Revised: 11 August 2013
Accepted manuscript online:

PACS:	42.50.Md	(Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency)
	78.20.hb	(Piezo-optical, elasto-optical, acousto-optical, and photoelastic effects)
	78.47.J-	(Ultrafast spectroscopy (<1 psec))

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11174195).

Corresponding Authors: Ma Guo-Hong, Cheng Zhen-Xiang
E-mail: ghma@staff.shu.edu.cn;cheng@uow.edu.au

About author: 42.50.Md; 78.20.hb; 78.47.J-

Cite this article:

Xu Yue (徐悦), Jin Zuan-Ming (金钻明), Zhang Zheng-Bing (张郑兵), Zhang Ze-Yu (张泽宇), Lin Xian (林贤), Ma Guo-Hong (马国宏), Cheng Zhen-Xiang (程振祥) Gigahertz longitudinal acoustic phonons originating from ultrafast ligand field transitions in hematite thin films 2014 Chin. Phys. B 23 044206

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Gigahertz longitudinal acoustic phonons originating from ultrafast ligand field transitions in hematite thin films

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