【学术报告】金奎娟：光与低维氧化物相互作用研究
光与物质相互作用是物态调控的核心手段之一，低维过渡金属氧化物不仅具有电荷、轨道、自旋等多自由度可调，及光电磁多物理性能相耦合等特性，尤其可通过组分和界面等对其功能进行多维度调控。解决其关键科学问题如氧化物薄膜的激光法精准可控生长、光学二次谐波探测揭示铁电与反铁磁等新机制、光电信息的感存算多功能融合，对光与物质相互作用领域发展、类脑神经突触模拟等人工智能等方面都具有重大意义。该报告谨分享研究团队近年来在该领域的一些研究进展。
光与物质相互作用是物态调控的核心手段之一，低维过渡金属氧化物不仅具有电荷、轨道、自旋等多自由度可调，及光电磁多物理性能相耦合等特性，尤其可通过组分和界面等对其功能进行多维度调控。解决其关键科学问题如氧化物薄膜的激光法精准可控生长、光学二次谐波探测揭示铁电与反铁磁等新机制、光电信息的感存算多功能融合，对光与物质相互作用领域发展、类脑神经突触模拟等人工智能等方面都具有重大意义。该报告谨分享研究团队近年来在该领域的一些研究进展。
The state-of-the-art technique of multispectral ophotoacoustic tomography (MSOT) is based on excitation of tissue at multiple wavelengths to visualise specific molecules within opaque tissue.
In this talk we will introduce the concept of photonic alloys as non-periodic topological materials.
如何在多界面复杂环境中对极化激元的性能实现多维、高效和精准调控是目前领域内面临的关键科学问题。为此，我们依托石墨烯表面等离激元与α相三氧化钼声子极化激元体系开展研究。利用极化激元的模式杂化耦合效应并结合功能天线设计、介电环境优化、范德华异质堆垛等材料与结构设计方法，实现了极化激元波长高效压缩、空间等频轮廓拓扑转变以及传输方向控制等功能。以此为基础，进一步构筑了面内双曲聚焦、无衍射传输透镜以及电可调负折射等纳米尺度光功能器件，展示了极化激元在纳米尺度的光操控能力。
Terahertz (THz) radiation, which is electromagnetic radiation in a frequency interval from 0.3 to 10 THz (1 mm – 30 μm wavelength), is the frontier in science and technology. Historically, THz technologies were used mainly within the astronomy community for studying the background of cosmic far-infrared radiation, and by the laser-fusion community for the diagnostics of plasmas.
In this lecture, I'll introduce photoemission spectroscopy and its applications in quantum materials research. The lecture begins with an introduction to electronic band structure, the basic working principles of photoemission spectroscopy, and its early use in material research. Later, I'll present state-of-the-art photoemission equipment and recent studies using these tools. The goal of this lecture is to provide a comprehensive overview of photoemission spectroscopy in condensed matter physics.
This lecture will review the recent progress in investigating a spontaneous build-up of macroscopic coherence in non-resonantly pumped semiconductor microcavities. Because of the strong interaction between excitons and cavity mode, the hybrid particles called polaritons appear. Inheriting high mobility and strong interactions from their constituents, these particles demonstrate superfluid behavior accompanied by spontaneous nucleation of vortices. I will describe experimental approaches for creation and manipulation of such peculiar structures including spatial confinement techniques. In addition, I will present a theoretical framework capable of explaining a number of recent experimental findings.
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