报告介绍 Abstract:　　The interplay between topology and electronic correlations has become a central theme in the study of moiré superlattices. Recent experiments revealing fractional topological phases in twisted bilayer MoTe2 have intensified interest in this material. In this talk, I will present our recent work on these fractional phases, emphasizing the modelling of single-particle band structures. Sp...

报告介绍 报告摘要：　　Fractional quantum Hall effect (FQHE) is a prime example of topological quantum many-body phenomena, arising from the interplay between strong electron correlation, topological order, and time reversal symmetry breaking. Recently, a lattice analog of FQHE at zero magnetic field has been observed, confirming the existence of a zero-field fractional Chern insulator (FCI). Despite this, t...

报告介绍 报告摘要：　　通过量子输运手段研究介观器件中蕴含的丰富量子现象是凝聚态物理的重要方向之一。将低维材料与超导结合构建复合介观器件，可以用于研究拓扑物态、拓扑超导、马约拉纳零能模等新奇现象。本报告将介绍基于一维纳米线和二维薄膜的约瑟夫森结中的如下研究：1）在纳米线约瑟夫森器件中，观测到安德烈夫束缚态与近藤效应的非平衡相互作用；进一步结合栅极调控，研究约瑟夫森结中的Landau-Zener-Stückelberg-Majorana（LZSM...

报告介绍 报告摘要：　　镍氧化物是近年来新兴的超导材料体系，继铜基和铁基超导材料之后，为非常规超导的研究提供了新的突破性平台。然而，目前镍氧化物的超导仅能在薄膜样品或高压条件下实现，其中毫米级块材单晶的获得依赖于高压浮区法设备和技术，制备难度大、门槛高。本报告将简要回顾超导类镍基量子材料的发展历程，然后介绍我们在三层镍氧化物体系和多晶型镍氧化物La3Ni2O7体系单晶生长、结构和物性研究方面的最新进展，并讨论分析镍基...

报告介绍 报告摘要：　　Moiré crystals support flat bands with significant electron correlation effects, providing a novel platform for realizing unconventional superconductivity. In this talk, I will discuss our recent theoretical work on unconventional superconducting phenomena in moiré crystals. In the first part of the talk, I will present our study of unconventional Josephson effects mediated by valley...

报告介绍 Abstract:　　Altermagnets, combining the strengths of ferromagnets and antiferromagnets, have emerged as an exciting platform for next-generation spintronic applications. Integrating (anti)ferroelectricity with altermagnetism results in multiferroic altermagnets, enabling precise manipulation of spin states through electric control of crystal symmetry. In this talk, I will introduce three distinct c...

报告介绍 Abstract：　　In the near-perfect vacuum of the Inter-Stellar Medium (ISM) a wide variety of complex organic molecules, including pre-biotics, are observed, which should have been frozen onto surfaces of dust grains at their thermal temperature of ~15K [1].  Complex molecules are most likely formed when mixtures of solid-phase small molecules covering dust grains are exposed to bond-breaking va...

报告介绍 报告人简介：　　孔杰，西北工业大学教授，洪堡学者，陕西省“三秦学者”特聘教授及创新团队带头人，主要从事超支化高分子设计合成及在电磁功能材料中应用的研究工作；主持国家杰出青年科学基金项目、联合基金重点项目、国家重大专项专题、国家重点研发计划课题等重点类项目4项及技术基础科研等国家级项目7项；以第一或通讯作者在Nat. Commun.、Adv. Funct. Mater.、Macromolecules等期刊发表论文180余篇，引用22000余次，2021-2024...

报告介绍 报告人简介：　　张秋禹，西北工业大学长聘教授，博导，教育部“长江学者”特聘教授，中国化工学会会士。主要从事有机多孔材料、功能与智能高分子和能源与催化材料研究。担任特种功能与智能高分子材料工信部重点实验室、西安市功能有机多孔材料重点实验室主任等职务。兼任中国材料研究学会高分子材料与工程分会委员、中国化学会高分子学科委员会委员、陕西省化学会副理事长等。近五年承担民机专项、国家重点研发项目、国家自然科学基...

报告介绍 报告摘要：　　自旋、电荷、晶格是固体材料中最为重要的自由度，它们之间的相互作用决定了材料的光电和输运性质。本报告将介绍我们在半导体自旋-电荷-晶格的相互作用光学探测和调控的最新研究进展，包括：激子-声子量子干涉和高阶拉曼散射[1-2]，声子可分辨边带拉曼冷却[3]，二维半导体和异质结单光子发射的DAP跃迁机制和缺陷态声子耦合[4-5]，二维反铁磁半导体的自旋-激子-声子耦合 [6]。　　参考文献　　[1] J. Zhang* et al....

报告介绍 Abstract 　　The anomalous Hall effect (AHE), conventionally associated with time-reversal symmetry breaking in ferromagnetic materials, has recently been observed in nonmagnetic topological materials, raising questions about its origin. We unravel the unconventional Hall response in the nonmagnetic Dirac material ZrTe5, known for its massive Dirac bands and unique electronic and transport propertie...

报告介绍 报告摘要：　　尽管理论工作早已预测激子自发凝聚现象和以量子自旋液体为代表的分数化激发，由于受限于材料制备和表征技术，相关的证据和原型实例仍十分缺乏。 在二维极限下，减弱的屏蔽效应和显著的量子涨落使得这些物态在低维系统中更为突出。因此，低维强关联体系为实验上探索这些物态提供了潜在途径。我们通过降低材料维度以减弱库伦屏蔽效应，在低维ZrTe₂和HfTe₂薄膜中发现了由激子凝聚产生的电子起源电荷密度波和金属-绝缘体转...

报告介绍 报告摘要：　　About two decades ago a mechanism for generating what later termed unconventional magnetism (UM) was proposed in analogy to unconventional superconductivity (PRL 93, 36403 (2004)) [1]. It is based on quantum phase transitions of the Landau-Pomeranchuk Fermi surface instability, spontaneously generating spin-multipole ordering and momentum-dependent spin splitting [2]. Later theoretical...

报告介绍 Abstract：        A key feature of the current transition from a fossil based energy system to a carbon neutral, fully sustainable mode of operation is energy conversion and storage. EU countries are leaders in the field of Sustainable Energy Generation, but its intermittent Nature without novel storage will restrict its relative contribution to about 50 %, taken Germany as a typ...

报告介绍 报告摘要：　　以蛋白质-核酸为代表的生物大分子间的相互作用在生命活动中具有重要的调控作用，氨基酸和核苷酸的结合方式和特征是相关分子机制的重要内容。研究氨基酸与核苷酸之间的相互作用是认识蛋白质-脱氧核糖核酸(DNA)和蛋白质-核糖核酸(RNA)相互识别本质的基础。为了认识氨基酸和脱氧核糖核苷酸之间相互作用原理的分子机制，探索蛋白质-核酸相互识别规律和本质，我们利用微球辅助的流式细胞术以及概率统计的基本原理，系统研究...

报告介绍 报告摘要：　　在量子世界中，量子几何定义了两个量子态之间的相位和幅值的差值。其中，量子态的相位差由我们熟知的Berry curvature所描述，而量子态的振幅差则由quantum metric所描述。通过对Berry curvature的研究，成功的解释了反常霍尔效应和拓扑量子现象等。那么quantum metric是否也可以产生有趣的量子现象呢？基于此问题，近几年quantum metric象也逐渐受到了科研界的关注。二维材料的出现，更是为我们探测和调控量子几何效应...