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class="title">案例新聞 | Nature Materials-鐵磁鈣鈦礦薄膜中由二維對稱保護節點結構引起的符號可調反?；魻栃?/h1> <p class="info"> <span class="source">文章來源：費勉儀器</span> <time class="time"> 發布時間：2021-10-13<time> <span class="view">瀏覽次數：<script language="javascript" type="text/javascript"> new Hits(29).GetNewsHits();</script>次</span> </p> <div class="nr"> <p> <span style="font-size:14px;">近日，韓國首爾國立大學（Seoul National University）Changyoung Kim教授團隊發表在Nature Materials上的研究工作，在文章中正式、書面地提到費勉儀器的紫外光源產品和品牌（FERMI INSTRUMENTS），我們將在此基礎上再接再厲，提升產品的性能，為全球更多用戶提供高質量、高性能的產品和技術支持。</span> </p> <p style="text-align:center;"> <img src="/UpLoadFile/20211013/d2451224-a80c-4000-9ab2-cfa20197f73d.png" width="900" height="567" alt="" /> </p> <p style="text-align:left;"> <span style="font-size:16px;color:#337FE5;"><strong>文章信息</strong></span> </p> <p style="text-align:center;"> <span style="font-size:16px;color:#337FE5;"><strong><img src="/UpLoadFile/20211013/fc0ef09e-4f09-43dc-bfc8-97be8e761c71.png" width="900" height="435" alt="" /><br /> </strong></span> </p> <p style="text-align:center;"> <span style="font-size:16px;color:#337FE5;"><strong><br /> </strong></span> </p> <p style="text-align:left;"> <span style="color:#337FE5;font-size:16px;"><strong>文章導讀</strong></span> </p> <p style="text-align:left;"> <span style="color:#337FE5;font-size:16px;"><strong><br /> </strong></span> </p> <p style="text-align:left;"> <span style="color:#337FE5;font-size:16px;"><span style="font-size:14px;color:#000000;">磁性和自旋軌道spin–orbit耦合，是流動鐵磁體拓撲傳輸現象背后的兩個典型成分。當自旋極化帶支持具有可通過自旋軌道耦合提升的帶簡并性的節點/線時，節點結構成為貝里曲率的來源，導致大的反?；魻栃?。然而，只有當存在適當的晶體對稱性時，二維系統才能擁有穩定的節點結構。</span><br /> <span style="font-size:14px;color:#000000;">韓國首爾國立大學Changyoung Kim教授團隊及其合作者在Nature Materials上發文報道了鈣鈦礦氧化物的二維自旋極化帶結構，證明了二維自旋極化帶的對稱保護節點結構和點控制反?；魻栃姆柡痛笮??；赟rRuO3 超薄膜（一種具有自旋軌道耦合的代表性金屬鐵磁體）的角分辨光電子能譜（ARPES）、輸運測量和理論分析，作者展示了鐵磁 SRO薄膜的拓撲能帶結構，特別是觀察并定義了超薄二維極限 SRO薄膜的能帶結構。通過理論分析，還揭示了自旋極化二維鐵磁體帶通常具有節點和 NL成為增強Berry曲率的來源。比較使用緊束縛模型測量能帶結構，確定源自多節點的Berry 曲率熱點結構，這導致了非常規的反?；魻栃??？梢酝ㄟ^改變薄膜來控制厚度、溫度、磁化強度和化學勢。這個發現將為研究二維磁系統結構中由對稱保護節點驅動的輸運現象開辟新的途徑，并促進發展基于磁拓撲工程能帶結構的磁器件以及基于鐵磁超薄膜的新型可切換設備。</span></span> </p> <p style="text-align:left;"> <span style="color:#337FE5;font-size:16px;"><span style="font-size:14px;color:#000000;"><br /> </span></span> </p> <p style="text-align:left;"> <span style="color:#337FE5;font-size:16px;"><span style="color:#337FE5;font-size:16px;"><strong>文章數據</strong></span></span> </p> <p style="text-align:center;"> <span style="color:#337FE5;font-size:16px;"><span style="color:#337FE5;font-size:16px;"><strong><img src="/UpLoadFile/20211013/ce7a4b99-196e-4bcf-82ab-b0eba05ea5e1.png" width="900" height="784" alt="" /><br /> </strong></span></span> </p> <p style="text-align:center;"> <span style="color:#000000;font-size:16px;"><span style="color:#000000;font-size:16px;"><span style="font-size:14px;color:#000000;">圖 1：二維鐵磁鈣鈦礦的費米面（FS）</span></span></span> </p> <p style="text-align:center;"> <span style="color:#337FE5;font-size:16px;"><span style="color:#337FE5;font-size:16px;"><strong><img src="/UpLoadFile/20211013/6b9dbd80-eef4-413a-b649-3f770f8d6af1.png" width="900" height="715" alt="" /><br /> </strong></span></span> </p> <p style="text-align:center;"> <span style="color:#000000;font-size:14px;"><span style="color:#000000;font-size:14px;">圖 2：SrRuO3薄膜角分辨光電子能譜ARPES 數據</span></span> </p> <p style="text-align:center;"> <span style="color:#337FE5;font-size:16px;"><span style="color:#337FE5;font-size:16px;"><strong><img src="/UpLoadFile/20211013/2bf4edbd-1e93-43b4-a85a-c51572a0e786.png" width="900" height="676" alt="" /><br /> </strong></span></span> </p> <p style="text-align:center;"> <span style="color:#000000;font-size:14px;"><span style="color:#000000;font-size:14px;">圖 3：SrRuO3超薄膜中的非單調反?；魻栃ˋHE）</span></span> </p> <p style="text-align:center;"> <span style="color:#337FE5;font-size:16px;"><span style="color:#337FE5;font-size:16px;"><strong><img src="/UpLoadFile/20211013/2e48af7d-401a-414b-b2e9-34a7968e694a.png" width="900" height="639" alt="" /><br /> </strong></span></span> </p> <p style="text-align:center;"> <span style="color:#000000;font-size:14px;"><span style="color:#000000;font-size:14px;">圖 4：節點線NLs和二維鐵磁鈣鈦礦中節點引起的符號可調反?；魻栃ˋHE）的機制</span></span> </p> <p style="text-align:center;"> <span style="color:#337FE5;font-size:16px;"><span style="color:#337FE5;font-size:16px;"><strong><img src="/UpLoadFile/20211013/34975ae2-6659-42ce-a9d3-b2c63987ca5c.png" width="900" height="580" alt="" /><br /> </strong></span></span> </p> <p style="text-align:center;"> <span style="color:#000000;font-size:14px;"><span style="color:#000000;font-size:14px;">圖 5：節點結構Berry 曲率熱點和SrRuO3超薄膜的可切換反?；魻栃ˋHE）</span></span> </p> <p style="text-align:center;"> <span style="color:#000000;font-size:14px;"><span style="color:#000000;font-size:14px;"><br /> </span></span> </p> <p style="text-align:center;"> <br /> </p> <p style="text-align:left;"> <span style="color:#000000;font-size:14px;">*文章導讀及文章數據部分引自“今日新材料”微信公眾號：（<a target="_blank">https://mp.weixin.qq.com/s/MmUNGSqUm0TpdfDKZ9IJfQ</a>），略有修改。</span> </p> <p style="text-align:left;"> <span style="font-size:14px;text-align:center;">相關鏈接：</span> </p> <p style="text-align:left;"> <span style="font-size:14px;text-align:center;"><a target="_blank">https://www.nature.com/articles/s41563-021-01101-4</a></span> </p> <p style="text-align:left;"> <span style="font-size:14px;text-align:center;"><a target="_blank">http://ares.snu.ac.kr/Equipment.html</a></span> </p> <p style="text-align:left;"> <span style="font-size:14px;text-align:center;"><a target="_blank">https://mp.weixin.qq.com/s/ieHMp_DLDyFQyaxGHmNfRw</a></span> </p> <div style="text-align:left;"> <span style="font-size:14px;"><a target="_blank">http://www.fermi.com/productclass_3/</a></span> </div> <p> <br /> </p> </div> <div class="targs-share-return"> <div class="targs"> <b>標簽：</b> <a href="/chao_gao_zhen_kong_MBE/" 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