论文标题
CSPBI3钙钛矿量子点中的激子Bloch-Siegert移动
Excitonic Bloch-Siegert shift in CsPbI3 perovskite quantum dots
论文作者
论文摘要
物质和周期光场之间的相干相互作用诱导光学鲜明效应（OSE）和Bloch-Siegert Shift（BSS）。观察BSS在历史上一直具有挑战性，这不仅是因为它很虚弱，而且经常伴随着更强的OSE。在此，通过控制光螺旋性，我们可以在很大程度上将OSE和BSS限制为CSPBI3 Perovskite量子点中的不同自旋转换，从而实现了带有近红外脉冲的4 MeV的室温BSS。但是，BSS和OSE幅度之间的比率在系统上高于通过非相互作用的准粒子图片的预测。通过明确解释激子效应的模型，我们定量再现了实验观察结果。该模型描述了低维材料中OSE，Biexcitonic OSE和BSS之间相互作用的统一物理图片，这些材料显示出强烈的多体相互作用，为信息处理，光学调制和Floquet工程实施这些效果构成了基础。
Coherent interaction between matter and periodic light field induces both optical Stark effect (OSE) and Bloch-Siegert shift (BSS). Observing the BSS has been historically challenging, not only because it is weak but it is often accompanied by a much stronger OSE. Herein, by controlling the light helicity, we can largely restrict the OSE and BSS to different spin-transitions in CsPbI3 perovskite quantum dots, achieving room-temperature BSS as strong as 4 meV with near-infrared pulses. The ratio between the BSS and OSE magnitudes is however systematically higher than the prediction by the non-interacting, quasi-particle picture. With a model that explicitly accounts for excitonic effects, we quantitatively reproduce the experimental observations. This model depicts a unified physical picture of the interplay between the OSE, biexcitonic OSE and BSS in low-dimensional materials displaying strong many-body interactions, forming the basis for the implementation of these effects to information processing, optical modulation and Floquet engineering.
