Publication Date:
2014-10-21
Description:
The photocarrier relaxation dynamics of EuTiO 3 films have been investigated using femtosecond transient absorption spectroscopy. Two kinds of EuTiO 3 films, with and without strain, have been included. In both films, the decay dynamics of 2 p -3 d t2g transition has a fast (∼2 ps) and slow (ns) components which are independent of the strain. Remarkably, the transient photobleaching of 4 f -3 d t2g transition is found to be enhanced considerably in the strained film, accompanied with a subnanosecond carrier lifetime. This behavior can be linked to the strain induced band structure modulation. Our results reveal the dynamical interactions in EuTiO 3 , identifying the critical roles of strain in photo induced phenomena.
Print ISSN:
0003-6951
Electronic ISSN:
1077-3118
Topics:
Physics
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