Nonlinear Optical Spectroscopy of Mixed-Valent Materials

9973343cundiff本项目将在太赫兹频率下寻找混合价材料的二阶光学非线性产生。在混合价材料中，导带中f电子态和d电子态之间存在能量重叠。该项目的结果将为f态和d态之间基态相干的存在提供新的基本见解。这种相干性的存在导致晶体反转对称性的破坏，这使得二次谐波的产生成为可能。相干性也意味着这些材料将形成一类新的电子铁电体。因为这些材料的带隙只有10兆电子伏，所以它与非常远的红外光共振。为了在这些波长产生足够强烈的脉冲，我们将使用基于放大的超短可见脉冲的太赫兹产生过程。该项目的结果将为理论提供重要的反馈，这与显示电子相关的广泛材料有关。这个项目将在太赫兹频率下寻找混合价材料的二阶光学非线性产生。该项目的结果将为理论提供重要的反馈，这与显示电子相关的广泛材料有关。这项研究将凝聚态物质与量子光学相结合，从而为研究生在这两个领域提供广泛的培训

9973343CundiffThis project will search for second order optical nonlinear generation in mixed valent materials at terahertz frequencies. In mixed valent materials, there is an energetic overlap between f electron states and the d electrons in the conduction band. The results of this project will provide new fundamental insight into the presence of ground state coherence between the f and d states. The presence of such coherence results in a breaking of the crystalline inversion symmetry, which makes second harmonic generation allowed. The coherence will also mean that these materials form a new class of electronic ferroelectrics. Because the bandgap in these materials amounts to only 10 meV, it is resonant with very far infrared light. To generate sufficiently intense pulses at these wavelengths, we will use the process known as terahertz generation that is based on amplified ultrashort visible pulses. The results of this project will provide important feedback to the theory, which is related to a wide range of materials that display electronic correlation.%%%This project will search for second order optical nonlinear generation in mixed valent materials at terahertz frequencies. The results of this project will provide important feedback to the theory, which is related to a wide range of materials that display electronic correlation. This research merges condensed matter with quantum optics, thereby providing graduate students with broad training in both areas.***