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<span>發布時間：2013-04-23</span> <span>作者：</span> <span>來源：科技部</span> <span id="hit">瀏覽：1184</span> </div> </div> <div id="weacqyw" class="pl20 pr20 pt10 mt2 tc"> <P> 近日，我國在量子科學研究中取得重大突破，在磁性摻雜的拓撲絕緣體薄膜中，首次觀測到量子反?；魻栃?。該成果被視為世界基礎研究領域的一項重要科學發現。<BR> 作為微觀電子量子行為的宏觀體現，量子霍爾效應一直在凝聚態物理研究中占據極其重要的地位，并可能在未來用于制備低能耗的高速電子器件。然而，量子霍爾效應的產生需要施加強磁場，因此，造價昂貴、體積龐大等因素限制了其走向實際應用。量子反?；魻栃鳛橐环N全新的量子效應，可使電子在不施加強磁場的情況下，按照固定軌跡運動，減少無規則碰撞導致的發熱和能量損耗，能夠用于發展新一代的低能耗晶體管和電子學器件。由于量子反?；魻栃c量子霍爾效應具有完全不同的物理本質，其實現也更加困難，需要精準的材料設計、制備與調控。因此，在理論和實驗上實現量子反?；魻栃蔀槟蹜B物理研究的一個重大挑戰。<BR> 在量子調控研究國家重大科學研究計劃的支持下，我國研究人員在理論與材料設計上獲得突破，提出磁性離子摻雜的拓撲絕緣體薄膜是實現量子反?；魻栃淖罴洋w系。同時，克服了薄膜生長、磁性摻雜、低溫輸運測量等難題，生長出高質量的摻雜拓撲絕緣體磁性薄膜，并在極低溫輸運測量裝置上成功觀測到了量子反?；魻栃Ａ孔臃闯；魻栃膶嶒灠l現，被認為有可能是量子霍爾效應家族的最后一個重要成員。研究成果將推動未來無能耗電子學的發展，有望加速推進信息技術革命的進程。 </P> <P> </P> </div> <div id="euquowm" class="dz fix tc"> <div id="aaugccs" class="fix"> <a href="javascript:;" class="click_nums" data-id="50123" data-type="1" > <img src="/statics/home/images/icon/41.png" class="img1"> <img 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