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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>南京大学物理学院</title> <link rel="stylesheet" href="/DFS//template/4254/images/common.css" /> <link rel="stylesheet" href="/DFS//template/4254/images/sub.css" /> <link rel="stylesheet" href="/DFS//template/4264/images/share.min.css"> <link rel="stylesheet" href="/DFS//template/4259//images/info.css" /> <script type="text/javascript" src="/njdx/front/ui/jquery/jquery.js?v=v4.0.2"></script><script type="text/javascript" src="/njdx/front/ui/jquery/jquery.base64.js?v=v4.0.2"></script><script type="text/javascript" src="/njdx/front/ui/boshan/ui.js" data-appurl="/njdx"></script><link type="text/css" rel="stylesheet" href="/njdx/front/ui/page/info.css?v=v4.0.2"/><link type="text/css" rel="stylesheet" href="/njdx/front/ui/page/channel.css?v=v4.0.2"/><script type="text/javascript" src="/njdx/front/ui/visit/visit.js?s=34&c=16196&v=v4.0.2"></script><script type="text/javascript" src="/njdx/front/ui/jwplayer/jwplayer.js?v=v4.0.2"></script><script type="text/javascript" src="/njdx/front/ui/jwplayer/bs.js?v=v4.0.2"></script><script type="text/javascript" src="/njdx/front/ui/pdf/build/pdf.js?v=v4.0.2"></script><script type="text/javascript" src="/njdx/front/ui/pdf/showpdf.js?v=v4.0.2"></script><script type="text/javascript" src="/njdx/front/ui/template/es5-shim.min.js?v=v4.0.2"></script><script type="text/javascript" src="/njdx/front/ui/template/es5-sham.min.js?v=v4.0.2"></script><script type="text/javascript" src="/njdx/front/ui/template/template-web.js?v=v4.0.2"></script><script type="text/javascript" src="/njdx/front/ui/template/template-bs.js?v=v4.0.2"></script> </head> <body> <script src="/DFS//template/4254/images/header.js"></script> <div class="g-mn"> <div class="mn-banner f-bgc"></div> <div class="mn-subNav"> <div class="warp"> <span>当前位置：</span> <a href="/">首页</a> > <a href="http://physics.nju.edu.cn/xwdt/index.html">新闻动态</a> > <a href="http://physics.nju.edu.cn/xwdt/xshd/index.html">学术活动</a> </div> </div> <div class="mn-infoBox warp"> <div class="mn-detailsWarp"> <div class="title"> 南京大学物理学院学术报告会（第49期） </div> <div class="control"> <span class="time">时间：2025-02-18</span> <span class="visit">浏览次数：<script type="text/javascript" src="/njdx/front/ui/visit/pv.js?s=34&c=16196"></script></span> </div> </div> <div class="mn-contentInfo"> <p style="margin-top: 0px; margin-bottom: 0px; white-space: normal; padding: 0px; font-family: "Microsoft Yahei", "PingFang SC", Avenir, "Segoe UI", "Hiragino Sans GB", STHeiti, "Microsoft Sans Serif", "WenQuanYi Micro Hei", sans-serif; line-height: 3em;"><span style="font-size: 18px;"><strong style="font-family: "Helvetica Neue", helvetica, "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;"><span style="font-family: 微软雅黑, sans-serif;">报告题目</span></strong><span style="font-family: 微软雅黑, sans-serif;">：</span></span><span style="font-size: 18px; font-family: "lucida Grande", Verdana; text-align: justify;">Unconventional magnetism</span></p><p style="margin-top: 0px; margin-bottom: 0px; white-space: normal; padding: 0px; font-family: "Microsoft Yahei", "PingFang SC", Avenir, "Segoe UI", "Hiragino Sans GB", STHeiti, "Microsoft Sans Serif", "WenQuanYi Micro Hei", sans-serif; line-height: 3em;"><span style="font-size: 18px;"><strong style="font-family: "Helvetica Neue", helvetica, "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;"><span style="font-family: 微软雅黑, sans-serif;">报告时间</span></strong><span style="font-family: 微软雅黑, sans-serif;">：<span style="font-family: "lucida Grande", Verdana;">2025年2月20日（周四）15:30</span></span></span></p><p style="margin-top: 0px; margin-bottom: 0px; white-space: normal; padding: 0px; font-family: "Microsoft Yahei", "PingFang SC", Avenir, "Segoe UI", "Hiragino Sans GB", STHeiti, "Microsoft Sans Serif", "WenQuanYi Micro Hei", sans-serif; line-height: 3em;"><span style="font-size: 18px; font-family: 微软雅黑, sans-serif; line-height: 19.26px;"></span></p><p style="margin-top: 0px; margin-bottom: 0px; white-space: normal; padding: 0px; font-family: "Microsoft Yahei", "PingFang SC", Avenir, "Segoe UI", "Hiragino Sans GB", STHeiti, "Microsoft Sans Serif", "WenQuanYi Micro Hei", sans-serif; line-height: 3em;"><span style="font-family: 微软雅黑, sans-serif; line-height: 19.26px; font-size: 18px;"></span></p><p style="margin-top: 0px; margin-bottom: 0px; white-space: normal; padding: 0px; font-family: "Microsoft Yahei", "PingFang SC", Avenir, "Segoe UI", "Hiragino Sans GB", STHeiti, "Microsoft Sans Serif", "WenQuanYi Micro Hei", sans-serif; line-height: 3em;"><span style="font-family: 微软雅黑, sans-serif; font-size: 18px;"></span></p><p style="margin-bottom: 0px; white-space: normal; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; line-height: 3em;"><span style="font-size: 18px;"><strong><span style="font-family: 微软雅黑, sans-serif;">报告地点</span></strong><span style="font-family: 微软雅黑, sans-serif;">：鼓楼校区唐仲英楼 B501</span></span></p><p style="margin-bottom: 0px; white-space: normal; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; line-height: 3em;"><span style="font-size: 18px;"><strong><span style="font-family: 微软雅黑, sans-serif;">报  告人</span></strong><span style="font-family: 微软雅黑, sans-serif;">：</span></span><span style="font-size: 18px; font-family: "lucida Grande", Verdana; text-align: justify;">吴从军（西湖大学）</span></p><p style="white-space: normal;"><span style="font-size: 18px;"><strong><span style="font-family: 微软雅黑, sans-serif;">摘      要：</span></strong></span></p><p style="white-space: normal; text-align: justify; line-height: 3em;"><span style="font-size: 18px; font-family: 微软雅黑, sans-serif;"></span></p><p style="white-space: normal; text-align: justify; text-indent: 2em; line-height: 3em;"><span style="font-size: 18px; font-family: 微软雅黑, sans-serif;"></span><span style="font-size: 18px; display: inline; background-color: rgba(0, 0, 0, 0); font-family: "times new roman";">Over two decades ago a mechanism for generating what later termed unconventional magnetism (UM) [1] was proposed in analogy to unconventional superconductivity (PRL 93, 36403 (2004)). It is based on quantum phase transitions of the Landau-Pomeranchuk Fermi surface instability, spontaneously generating spin-multipole ordering and momentum-dependent spin splitting. Later theoretical investigation was systematically developed by Wu, Sun, Zhang and Fradkin (PRB 75, 115103(2007)): The symmetry and topological defects were analyzed by composed operations of non-equivalent orbital and spin rotations, i.e., spin-space group type operations in later literatures; properties proposed for experiment tests include temperature-dependent spin splitting detectable by ARPES and Shubnikov–de Haas oscillations, coupling between strain and magnetization, and resonance modes in inelastic neutron scatting spectra, etc. UM was generalized to orbital band systems to explain the nematic metamagnetism observed in Sr<sub>3</sub>Ru<sub>2</sub>O<sub>7</sub> (PRB 80, 104438(2009)).</span></p><p style="text-align: justify; text-indent: 16px; background-color: rgba(0, 0, 0, 0); line-height: 3em;"><span style="font-size: 18px; font-family: "times new roman";">From the symmetry perspective, altermagnetism corresponds to the collinear version of UM (alpha-phase) in even partial-wave numbers. It is worth mentioning that the distorted Fermi surfaces in the d-wave state and the spin current generation by charge current shown in Wu’s presentation in 2007 [1] are the same as the now-iconic illustration of altermagnetism. In addition, UM states can exhibit non-colinear spin multipole orders (beta-phase) and exist in odd partial-wave channels maintaining time-reversal symmetry beyond altermagnetism. These deep connections offer insights into their shared theoretical underpinnings. As for a recent development (</span><a editorwarp__="1" href="https://arxiv.org/abs/2501.13616" target="_blank" style="outline: none; color: rgb(0, 0, 0); display: inline; background-color: rgba(0, 0, 0, 0); text-decoration: underline; font-size: 18px; font-family: "times new roman";"><span style="font-size: 18px; font-family: "times new roman";">arXiv:2501.13616</span></a><span style="font-size: 18px; font-family: "times new roman";">), we reconcile conflicting experimental and theoretical reports in RuO<sub>2</sub> by attributing it to the proximity to a quantum phase transition [2]. We emphasize its potential as a platform for investigating quantum phase transitions and the broader realm of UM.</span></p><p style="text-align: justify; text-indent: 16px; background-color: rgba(0, 0, 0, 0); line-height: 3em;"><span style="background-color: rgba(0, 0, 0, 0); text-indent: 0px; font-size: 18px; font-family: "times new roman";">[1]The earliest online record of the term “Unconventional Magnetism” (to our knowledge) appears in a talk given by Wu at the KITP, UCSB on May 16, 2007, <a href="https://online.kitp.ucsb.edu/online/coldatoms07/wu1/" target="_blank" style="outline: none;color: rgb(42, 88, 111)">https://online.kitp.ucsb.edu/online/coldatoms07/wu1/</a></span></p><p style="text-align: justify; text-indent: 16px; background-color: rgba(0, 0, 0, 0); line-height: 3em;"><span style="text-indent: 2em; background-color: rgba(0, 0, 0, 0); font-size: 18px; font-family: "times new roman";">[2]Comparison between unconventional superconductivity and magnetism</span></p><p style="text-align: center;"><img src="/DFS//file/2025/02/18/20250218091526911msatwd.png" style="width: 690px; height: 442px;" title="图1_47285图1" width="690" height="442"/></p><p></p><p style="margin-top: 0px; margin-bottom: 0px; white-space: normal; padding: 0px; font-family: "Microsoft Yahei", "PingFang SC", Avenir, "Segoe UI", "Hiragino Sans GB", STHeiti, "Microsoft Sans Serif", "WenQuanYi Micro Hei", sans-serif; font-size: 16px; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; line-height: 3em;"><strong style="text-align: justify; text-indent: 34px; font-size: 18px;"><span style="font-family: 微软雅黑, sans-serif;">直播信息：</span></strong></p><p style="white-space: normal;"><br/></p><p></p><section style="white-space: normal; margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; color: rgba(0, 0, 0, 0.9); font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, Arial, sans-serif; font-size: 16px; letter-spacing: 1px; overflow-wrap: break-word !important;"><section style="margin: 0px; padding: 0px 18px; outline: 0px; max-width: 100%; box-sizing: border-box; line-height: 1.75em; letter-spacing: 1.5px; font-size: 14px; color: rgb(63, 63, 63); background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; overflow-wrap: break-word !important;"><section style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word !important;"><section style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; width: auto; overflow-wrap: break-word !important;"><section style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word !important;"><section style="margin: 5px 0px 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word !important;"><section style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; line-height: 1.5em; text-indent: 2em; overflow-wrap: break-word !important;"><section style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; text-indent: 2em; overflow-wrap: break-word !important;"><section style="margin: 8px 0px 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word !important;"><section style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word !important;"><section style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; line-height: 1.5em; text-align: justify; overflow-wrap: break-word !important;"><section style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; font-family: Optima-Regular, PingFangTC-light; letter-spacing: 0px; line-height: 1.6; overflow-wrap: break-word !important;"><section style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; font-size: 15px; line-height: 1.75; font-family: "Noto Sans CJK SC", -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; letter-spacing: 1px; overflow-wrap: break-word !important;"><p style="margin-top: 0px; margin-bottom: 0px; word-break: break-all; padding: 0px; box-sizing: border-box; line-height: 3em;"><span style="font-size: 18px; font-family: 微软雅黑, sans-serif; color: rgb(0, 0, 0);"></span></p><p style="margin-top: 0px; margin-bottom: 0px; word-break: break-all; padding: 0px; box-sizing: border-box; line-height: 3em;"><span style="font-size: 18px; font-family: 微软雅黑, sans-serif; color: rgb(0, 0, 0);">第49期学术报告会将通过寇享同步直播，观看方式如下：</span></p><p style="margin-top: 0px; margin-bottom: 0px; word-break: break-all; padding: 0px; box-sizing: border-box; line-height: 3em;"><span style="font-size: 18px; font-family: 微软雅黑, sans-serif; color: rgb(0, 0, 0);">1、直播链接：<a href="https://www.koushare.com/live/details/40699" target="_self">https://www.koushare.com/live/details/40699</a></span></p><p style="margin-top: 0px; margin-bottom: 0px; word-break: break-all; padding: 0px; box-sizing: border-box; line-height: 3em;"><span style="color: rgb(0, 0, 0); font-family: 微软雅黑, sans-serif; font-size: 18px; text-indent: 2em;">2、扫描二维码观看直播：</span></p><p style="margin-top: 0px; margin-bottom: 0px; word-break: break-all; padding: 0px; box-sizing: border-box; line-height: 3em;"><span style="color: rgb(0, 0, 0); font-family: 微软雅黑, sans-serif; font-size: 18px; text-indent: 2em;"></span></p><p style="text-align: left; text-indent: 2em;"><img src="/DFS//file/2025/02/18/20250218091501872lj9sju.png" style="width: 299px; height: 298px;" title="蔻享" width="299" height="298"/></p><section style="font-size: 16px; margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; color: rgba(0, 0, 0, 0.9); font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, Arial, sans-serif; overflow-wrap: break-word !important;"><section style="margin: 0px; padding: 0px 18px; outline: 0px; max-width: 100%; box-sizing: border-box; line-height: 1.75em; letter-spacing: 1.5px; font-size: 14px; color: rgb(63, 63, 63); background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; overflow-wrap: break-word !important;"><section style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word !important;"><section style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; width: auto; overflow-wrap: break-word !important;"><section style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word !important;"><section style="margin: 5px 0px 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word !important;"><section style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; line-height: 1.5em; text-indent: 2em; overflow-wrap: break-word !important;"><section style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; text-indent: 2em; overflow-wrap: break-word !important;"><section style="margin: 8px 0px 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word !important;"><section style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word !important;"><section style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; line-height: 1.5em; overflow-wrap: break-word !important;"><section style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; font-family: Optima-Regular, PingFangTC-light; letter-spacing: 0px; line-height: 1.6; overflow-wrap: break-word !important;"><section style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; font-size: 15px; line-height: 1.75; font-family: "Noto Sans CJK SC", -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; letter-spacing: 1px; overflow-wrap: break-word !important;"><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; text-align: center;"><strong style="color: rgb(0, 0, 0); text-indent: 2em; font-size: 18px; font-family: "Microsoft Yahei", "PingFang SC", Avenir, "Segoe UI", "Hiragino Sans GB", STHeiti, "Microsoft Sans Serif", "WenQuanYi Micro Hei", sans-serif;"><span style="font-family: 微软雅黑, sans-serif;">主办</span></strong><span style="color: rgb(0, 0, 0); text-indent: 2em; font-size: 18px; font-family: 微软雅黑, sans-serif;">：南京大学物理学院、江苏省物理学会</span></p></section></section></section></section></section></section></section></section></section></section></section></section></section><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: "Microsoft Yahei", "PingFang SC", Avenir, "Segoe UI", "Hiragino Sans GB", STHeiti, "Microsoft Sans Serif", "WenQuanYi Micro Hei", sans-serif; font-size: 16px; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; line-height: 3em; text-align: center;"><span style="font-family: 微软雅黑, sans-serif; font-size: 18px;"><strong style="font-family: "Microsoft Yahei", "PingFang SC", Avenir, "Segoe UI", "Hiragino Sans GB", STHeiti, "Microsoft Sans Serif", "WenQuanYi Micro Hei", sans-serif;"> 联系人</strong>：<span style="font-family: "lucida Grande", Verdana;">杜灵杰，<span style="color: rgb(42, 88, 111); text-decoration: underline;"><a href="mailto:Ljdu@nju.edu.cn" target="_blank" style="outline: none; color: rgb(38, 126, 240);">Ljdu@nju.edu.cn</a></span></span></span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: "Microsoft Yahei", "PingFang SC", Avenir, "Segoe UI", "Hiragino Sans GB", STHeiti, "Microsoft Sans Serif", "WenQuanYi Micro Hei", sans-serif; font-size: 16px; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; line-height: 3em;"><span style="font-size: 18px; font-family: "lucida Grande", Verdana; color: rgb(42, 88, 111);"></span></p><p style="text-align: center;"><img src="/DFS//file/2025/02/18/20250218091134330z2e9mt.jpg" style="width:800px;" title="吴从军老师"/></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: "Microsoft Yahei", "PingFang SC", Avenir, "Segoe UI", "Hiragino Sans GB", STHeiti, "Microsoft Sans Serif", "WenQuanYi Micro Hei", sans-serif; 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