Dynamics of photoinduced phenomena in AV_<10>O_<15> (A=Ba, Sr)
Dynamics of photoinduced phenomena in AV_<10>O_<15> (A=Ba, Sr)
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AV_<10>O_<15> (A=Ba, Sr) 中光诱导现象的动力学
DOI：
10.1103/physrevb.84.214442
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
T.Katsufuji
中科院分区：
文献类型：
--
作者：
A.Nogami;K.Takubo;T.Kajita;M.Hoshino;T.Katsufuji
我们研究了光致现象（A= Ba, Sr）中基态从有V三聚化的绝缘态（Ba）转变为无结构异常的绝缘态（Sr）的动力学过程。我们发现，光诱导反射率变化的时间依赖性在几皮秒内是相似的，但在几十皮秒的范围内，两种化合物之间的时间依赖性是截然不同的。这些不同的行为可以归因于光激发态的耦合模式和晶格畸变，这种畸变在srvo晶体中传播，但被困在BaVO中自由能的局部最小值中。
We studied the dynamics of photoinduced phenomena inAVO(A= Ba, Sr), where the ground state changes from an insulating state with V trimerization (Ba) to another insulating state with no structural anomaly (Sr). We found that the time dependence of photoinduced reflectivity change is similar up to several picoseconds, but is critically different in the range of several tens of picoseconds between the two compounds. These different behaviors can be attributed to the coupled mode of the photoexcited electronic state and the lattice distortion, which propagates in the crystal of SrVObut is trapped in the local minimum of the free energy in BaVO.