激子
声子
锐钛矿
超短脉冲
材料科学
纳米颗粒
紫外线
光谱学
化学物理
光电子学
纳米技术
凝聚态物理
物理
化学
光学
激光器
量子力学
催化作用
光催化
生物化学
作者
Edoardo Baldini,Tania Palmieri,A. Domínguez,P. Ruello,Ángel Rubio,Majed Chergui
出处
期刊:Nano Letters
[American Chemical Society]
日期:2018-07-24
卷期号:18 (8): 5007-5014
被引量:26
标识
DOI:10.1021/acs.nanolett.8b01837
摘要
The way nuclear motion affects electronic responses has become a very hot topic in materials science. Coherent acoustic phonons can dynamically modify optical, magnetic, and mechanical properties at ultrasonic frequencies, with promising applications as sensors and transducers. Here, by means of ultrafast broadband deep-ultraviolet spectroscopy, we demonstrate that coherent acoustic phonons confined in anatase TiO2 nanoparticles can selectively modulate the oscillator strength of the two-dimensional bound excitons supported by the material. We use many-body perturbation-theory calculations to reveal that the deformation potential is the mechanism behind the generation of the observed coherent acoustic wavepackets. Our results offer a route to manipulate and dynamically tune the properties of excitons in the deep-ultraviolet at room temperature.
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