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

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

中国物理B ›› 2014, Vol. 23 ›› Issue (4): 44206-044206.doi: 10.1088/1674-1056/23/4/044206

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

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

徐悦^a, 金钻明^{a b}, 张郑兵^a, 张泽宇^a, 林贤^a, 马国宏^a, 程振祥^c

a Laboratory of Ultrafast Photonics, Department of Physics, Shanghai University, Shanghai 200444, China;
b Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany;
c Institute for Superconductor and Electronic Materials, University of Wollongong, Squires Way, North Wollongong, NSW 2500, Australia

收稿日期:2013-06-12 修回日期:2013-08-11 出版日期:2014-04-15 发布日期:2014-04-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11174195).

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

Xu Yue (徐悦)^a, Jin Zuan-Ming (金钻明)^{a b}, Zhang Zheng-Bing (张郑兵)^a, Zhang Ze-Yu (张泽宇)^a, Lin Xian (林贤)^a, Ma Guo-Hong (马国宏)^a, Cheng Zhen-Xiang (程振祥)^c

a Laboratory of Ultrafast Photonics, Department of Physics, Shanghai University, Shanghai 200444, China;
b Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany;
c Institute for Superconductor and Electronic Materials, University of Wollongong, Squires Way, North Wollongong, NSW 2500, Australia

Received:2013-06-12 Revised:2013-08-11 Online:2014-04-15 Published:2014-04-15
Contact: 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-
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11174195).

摘要/Abstract

摘要： 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.

关键词: α-Fe₂O₃, pump-probe technique, acoustic phonons, ligand field

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.

Key words: α-Fe₂O₃, pump-probe technique, acoustic phonons, ligand field

中图分类号: (Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency)

42.50.Md

78.20.hb (Piezo-optical, elasto-optical, acousto-optical, and photoelastic effects) 78.47.J- (Ultrafast spectroscopy (<1 psec))

徐悦, 金钻明, 张郑兵, 张泽宇, 林贤, 马国宏, 程振祥. Gigahertz longitudinal acoustic phonons originating from ultrafast ligand field transitions in hematite thin films[J]. 中国物理B, 2014, 23(4): 44206-044206.

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[J]. Chin. Phys. B, 2014, 23(4): 44206-044206.

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

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

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