Evidence for light-induced hole polarons in LiNbO3 -: art. no. 067404
Evidence for light-induced hole polarons in LiNbO3 -: art. no. 067404
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DOI：
10.1103/physrevlett.95.067404
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发表时间：
2005-08-05
影响因子：
8.6
通讯作者：
Krätzig, E
中科院分区：
文献类型：
--
作者：
Herth, P;Granzow, T;Krätzig, E
532 nm脉冲光照后，在蓝绿光谱范围内观察到LiNbO3的瞬态光诱导吸收。它在掺铁LiNbO3中的形成和衰减可以用两个拉伸指数函数的和来满意地描述。然而，对于未掺杂的LiNbO3，只观察到一个拉伸指数衰减。这些实验结果可以用小的Nb-Li（4+）电子极化子和O空穴极化子的形成来解释。在提出的波段方案的基础上，对其机理进行了讨论。
Transient light-induced absorption in LiNbO3 is observed in the blue-green spectral range after pulsed illumination with 532 nm. Its buildup and decay in Fe-doped LiNbO3 is satisfactorily described by a sum of two stretched exponential functions. For undoped LiNbO3, however, only one stretched exponential decay is observed. These experimental results are explained by the formation of both small Nb-Li(4+) electron polarons and O- hole polarons. The mechanism is discussed on the basis of a proposed band scheme.