竞彩足球比分

报告题目：Two-Dimensional Fully Compensated Ferrimagnetism

报告嘉宾：刘铖铖，北京理工大学 教授

报告时间：2025年9月15日 14:00

报告地点：吉林大学中心校区唐敖庆楼B区521报告厅

主持人：王彦超

报告摘要

　　Antiferromagnetic spintronics has long been a subject of intense research interest, and the recent introduction of altermagnetism has further ignited enthusiasm in the field. However, fully compensated ferrimagnetism, which exhibits band spin splitting but zero net magnetization, has yet to receive enough attention. Since the experimental preparation of 2D magnetic van der Waals materials in 2017, 2D magnetic materials, thanks to their super tunability, have quickly become an important playground for spintronics. In the first part of the talk, we extend the concept of fully compensated ferrimagnetism (fFIM) to two dimensions and propose 2D filling-enforced fFIM, demonstrate its stability and ease of manipulation, and present three feasible realization schemes with respective exemplary candidate materials. A simple model for 2D fully compensated ferrimagnets (fFIMs) is developed. Further investigation of 2D fFIMs’ physical properties reveals that they not only exhibit significant magneto-optical response but also show fully spin-polarized currents and the anomalous Hall effect in the half-metallic states, displaying characteristics previously almost exclusive to ferromagnetic materials. In the second part of the talk, we propose a platform based on fFIMs for realizing and controlling topological superconductivity with Majorana bound states across multiple dimensions, including (i) Majorana zero modes localized at the ends of 1D nanowires, (ii) chiral Majorana edge states along 2D boundaries, and (iii) tunable Majorana corner modes in higher-order topological phases. The unique properties of fFIMs enable an electric field to drive topological superconductivity phase transitions and N´eel vector orientation to control the spatial distribution of Majorana modes. Our results establish fFIM-based heterostructures as a versatile platform for tunable topological superconductivity.

嘉宾简介

刘铖铖，北京理工大学竞彩足球比分 教授，2013年在中科院物理所获得博士学位。从事计算物理与凝聚态理论研究，在量子材料设计和物性探索方面取得重要进展。1. 发展和开发了通用的二维转角/摩尔材料体系电子结构计算方法和程序，构建了应用广泛的有效模型并被命名为LYFE模型；2. 通过巧妙的结构设计和轨道选择在国际上首次设计和预测一系列高品质的拓扑量子材料，其中多个理论预言被实验证实；3. 提出了利用转角产生和操控具有任意分波形式的二维交错磁性的通用方法和提出了填充强制(filling-enforced)的二维完全补偿亚铁磁性的概念。发表论文50余篇，包括14篇PRL，共被引用11000余次。2020-2024连续五年入选Elsevier中国高被引学者（物理学）。获2018国家自然科学奖二等奖[排名2]、2018 NJP Early Career Award、国家级青年人才（2019）。现任NJP 期刊编委（2020-至今）。

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竞彩足球比分-竞彩足球比分预测

物质模拟方法与软件教育部重点实验室