报告介绍 Abstract： 　　In most conventional superconductors, electron pairing results in translationally invariant charged superfluids with spatially uniform superfluid density. However, electron pairs can form crystalline states known as pair density waves (PDWs) that break translational symmetry from coupling with density wave orders. Experimental evidence of such exotic states remains scarce due to techn...

报告介绍 Abstract： 　　Common computational methods in condensed matter physics typically rely on the stationary Schrödinger equation, which involves diagonalizing the Hamiltonian and poses challenges for large systems. This talk primarily focuses on the transformation of solved problems from the stationary Schrödinger equation to the time-dependent Schrödinger equation, thereby circumventing the need for d...

报告介绍 报告摘要：　　Complex materials with novel properties, such as heavy-Fermion compounds and high-Tc superconductors, have drawn intensive interest not only for their potential applications in material and quantum information science but also for their scientific significance. However, accurately modeling these materials has been a challenge. Therefore, the development of advanced computational method...

报告介绍 报告摘要：　　近年来飞秒-阿秒等超快激光技术迅猛发展，它们与各类传统探测手段相结合，使得在飞秒乃至更快时间尺度上实时探测量子材料等复杂凝聚态体系的电子-原子核多体量子动力学过程成为可能，从而逐渐形成聚焦于凝聚态物理超快现象研究的这一新领域。这些新发展不可避免地带来理论上的挑战，急需发展崭新的理论框架和计算工具。本报告将介绍该领域的一些前沿进展，以及面对挑战我们发展的第一性原理激发态动力学理论计算工具，...

报告介绍 报告简介：　　冷靶反冲离子动量谱仪（Cold Target Recoil Ion Momentum Spectroscopy，COLTRIMS）技术上个世纪80年代末期由德美等国科学家提出，经过不断优化，成为本世纪研究原子分子碰撞过程的最有力工具之一，目前我国大约有十多套动量谱仪在运转。在报告中将介绍动量谱仪工作原理，并以复旦大学开展的工作为例，介绍其在原子分子碰撞研究中的应用。 报告人简介：　　魏宝仁，复旦大学教授，博士生导师。核科学与技术系副主...

报告介绍 Abstract:　　Vibrational spectroscopic imaging, providing molecular fingerprint information, opens a new way of watching biomolecules at work in a living system. Developed over the past two centuries, advanced vibrational microscopes based on coherent Raman scattering and pump-probe photothermal detection have enabled highly sensitive and high-speed bond-selective imaging of a broad range of molecul...

报告介绍 报告摘要：　　原子分子电离或激发诱导的弛豫过程是物理、化学等领域基本的超快动力学反应之一，通常体系会以俄歇过程、分子解离、辐射光子等方式实现能量传递。然而，当被电离或激发的原子分子周围存在其他单元时（即团簇或原子分子聚集体系中），会发生一系列新的能量传递方式，比如分子间能量转移ICD（intermolecular Coulombic decay）、分子间电子转移、质子转移和电荷迁移等超快物理化学过程。电子碰撞实验是研究物质结构和动...

报告介绍 Abstract：　　A quasiparticle in solid state is a composite of a true particle or excitation and its screening charge. Screening is the collective response of the system to the particle potential that reduces the interaction of the subsystem with other degrees of freedom. The screening timescale is defined by the collective plasmon response to an exposed excitation field. As screening is reduced on ...

报告介绍 报告简介：　　极化子作为单个电子和晶格畸变关联作用而形成的准粒子，在电荷输运、巨磁电阻、高温超导以及热电和多铁效应等物理过程中具有重要作用。传统上对极化子的研究采用系综平均的宏观测量手段，在原子尺度研究单个独立极化子的行为对揭示电子-晶格耦合的关联物理机制具有重要作用，但是难以实现。在本报告中，我们通过分子束外延生长制备低维量子结构，利用基于扫描隧道显微学的测量和操纵手段，在单层卤化物晶体中发现了电...

报告介绍 报告摘要：　　The alkali-doped fullerides A3C60 (A = K, Rb, Cs) exhibit strong correlation and unconventional superconductivity (SC) in both bulk and thin films. We investigate the unconventional pairing mechanism in bulk A3C60 using dynamical mean-field theory (DMFT) in the Nambu formalism. The local orbital fluctuations are found to be substantially enhanced in the superconducting state and provid...

报告介绍 报告摘要：　　本次报告，我将汇报两个工作。一是在界面超导FeSe/SrTiO3中电子条纹相的发现。过往，对该体系衬底SrTiO3的研究已较为充分，我们回归FeSe本身。我们发现，在薄膜状的FeSe中，增强的电子关联性和各向异性，会诱导出条纹状的电荷调制。该电子液晶相与超导相互竞争，电荷掺杂会抑制条纹相，进而诱导超导的重新出现。我们还发现，掺杂后形成的超导与体系固有条纹相的强度呈正相关，因此，该有序态是实现界面超导增强的新机...

报告介绍 报告摘要：　　2019年美国斯坦福大学Hwang教授课题组发现了无限层镍氧化物外延薄膜的超导电性（镍基超导），为超导物理和材料的研究开辟了新方向[1]。镍基超导材料具有二维无限层晶体结构和与铜基超导类似的3d9-x电子构型，是深入研究类铜基高温超导的模型体系，对于揭示高温超导的物理机制具有重要意义。近4年来，镍基超导的研究取得了许多新的突破（基态电子结构、掺杂相图、低能磁激发、电荷有序等），但也存在着关于磁性的争论和...

报告介绍 报告摘要：　　传统的光生电流（光生伏打）效应通常需要异质结构的材料设计，例如半导体p-n结或异质界面，才可以获得单向的稳定电流。物理学家和材料学家指出在中心对称性破缺的体系中，可以通过非线性光学来获得稳定的直流电。这一过程目前已经被广泛研究和证实，并有潜力突破Shockley–Queisser极限。我们根据Kubo二阶响应理论提出通过非接触式的光照，可以在中心对称破缺的材料中诱导出电流，并在一系列二维铁电/磁性材料中计算讨...

报告介绍 Abstract：　　With the dimension scaling, the transistor gate controllability becomes weaker owing to the pronounced source-drain tunneling. Hence, the transistor body thickness needs to be reduced to ensure efficient electrostatic control. New materials such as “ultra-thin” 2D semiconducting materials have attracted attention.In thistalk, I would like to provide analysis and arguments on the poss...

报告介绍 Abstract:　　Important properties of materials, such as crystal structure, activity and selectivity of a catalyst, or a thermoelectric’s figure of merit, are in general difficult to predict, in particular from first principles. The problem lies in the extreme complexity of the relation between the atomic composition of a material and its functional properties. We demonstrate how to bridge this comp...

报告介绍 报告摘要：　　随着材料科学和生命科学等学科的不断发展，对于分子和细胞水平的精确观察成为了关键。 通过荧光寿命成像显微镜 ( FLIM, Fluorescence Lifetime Imaging Microscopy )技术，PicoQuant 为科学家们提供了强大的工具和持续的支持 ，以更深入地理解新型材料和生物系统等领域中的复杂问题。在材料科学领域，本报告将展示如何将时间分辨共聚焦显微技术（如 FLIM、PLIM以及antibunching），和光谱技术（如TRPL或波长扫描）结合...