Coulomb correction to the dressed exciton in an inorganic-organic layered semiconductor: Detuning dependence of the Stark shift
Coulomb correction to the dressed exciton in an inorganic-organic layered semiconductor: Detuning dependence of the Stark shift
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无机-有机层状半导体中修饰激子的库仑校正：斯塔克位移的失谐依赖性
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
T. Ishihara
中科院分区：
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作者：
M. Shimizu;N. Gippius;S. Tikhodeev;T. Ishihara
我们报道了无机-有机层状半导体（c6h5c2h4nh3） 2pbi4中激子光学Stark位移的失调谐依赖，作为一种典型的有效库仑相互作用强的材料。我们展示了失谐光谱的偏振依赖性，即在激子共振以下的350 meV范围内，作为连续变化的泵浦光子能量的函数的位移。发现在泵浦灯和探针灯的反圆和共线偏振配置下，位移在激子共振以下的50 meV处改变其符号，并且在激子共振周围共振增强。对于较大的失谐，在任何极化中，蓝移都比穿着激子模型预测的要小得多。我们提出了一个尝试性的模型，这是一个扩展的盛装激子模型，在现象学上包括激子分子和未结合的双激子。该模型较好地再现了实验结果。
We report the detuning dependence of the excitonic optical Stark shift in the inorganic-organic layered semiconductor (C 6 H 5 C 2 H 4 NH 3 ) 2 PbI 4 as a typical material in which the effective Coulomb interaction is strong. We show the polarization dependence of the detuning spectra, i.e., the shifts as functions of continuously changing pump photon energy, over the range of 350 meV below the exciton resonance. It is found that in the opposite-circularly and colinearly polarized configurations for pump and probe lights, the shift changes its sign at 50 meV below the exciton resonance and is resonantly enhanced around it. With larger detuning, in any polarizations, blue shifts are much smaller than predicted by the dressed exciton model. We present a tentative model, which is an extended dressed exciton model including the excitonic molecule and unbound biexcitons phenomenologically. The model reproduces the experimental result quite well.