{"id":220094,"date":"2021-04-05T13:00:25","date_gmt":"2021-04-05T05:00:25","guid":{"rendered":"http:\/\/www.cailiaoniu.com\/?p=220094"},"modified":"2021-04-05T15:09:07","modified_gmt":"2021-04-05T07:09:07","slug":"%ef%bc%88%e5%b7%b2%e6%a0%a1%e7%a8%bf%e4%bb%b6%ef%bc%89%e5%a4%a9%e6%89%8d%e5%b0%91%e5%b9%b4%e6%9b%b9%e5%8e%9f%ef%bc%8c%e5%86%8d%e6%b7%bb%e4%b8%80%e7%af%87nature","status":"publish","type":"post","link":"http:\/\/www.cailiaoniu.com\/?p=220094","title":{"rendered":"\u5929\u624d\u5c11\u5e74\u66f9\u539f\uff0c\u518d\u6dfb\u4e00\u7bc7Nature"},"content":{"rendered":"

\u3010\u80cc\u666f\u4ecb\u7ecd\u3011<\/strong><\/p>\n

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\u3010\u6210\u679c\u7b80\u4ecb\u3011<\/strong><\/p>\n

\u8fd1\u65e5\uff0c\u7f8e\u56fd\u9ebb\u7701\u7406\u5de5\u5b66\u9662\uff08MIT\uff09\u7684Pablo Jarillo-Herrero\u548c\u66f9\u539f\uff08\u5171\u540c\u901a\u8baf\u4f5c\u8005\uff09\u7b49\u4eba<\/strong>\u62a5\u9053\u4e86\u4ed6\u4eec\u901a\u8fc7\u540c\u65f6\u8fdb\u884c\u70ed\u529b\u5b66\u548c\u8f93\u8fd0\u6d4b\u91cf\uff0c\u7814\u7a76\u4e86\u9b54\u89d2\u626d\u66f2\u53cc\u5c42\u77f3\u58a8\u70ef\uff08MATBG\uff09\u7684\u7834\u788e\u5bf9\u79f0\u591a\u4f53\u57fa\u6001\u53ca\u5176\u975e\u5e73\u51e1\u7684\u62d3\u6251\u7ed3\u6784\u3002\u4f5c\u8005\u76f4\u63a5\u89c2\u5bdf\u5230\u504f\u7231\u5bf9\u79f0\u6027\u7834\u88c2\u662fmoir\u00e9\u8d85\u6676\u683c\u6240\u6709\u6574\u6570\u4e2d\u5316\u5b66\u52bf\u7684\u9489\u624e\u6548\u5e94\uff0c\u8868\u660e\u4e86\u5728\u591a\u4f53\u57fa\u6001\u4e2d\u504f\u7231Hund\u8026\u5408\u7684\u91cd\u8981\u6027\u3002\u5728\u6253\u7834\u65f6\u95f4\u53cd\u8f6c\u5bf9\u79f0\u6027\u540e\uff0c\u57fa\u672c\u5e73\u5766\u5e26\u7684\u62d3\u6251\u6027\u8d28\u5c31\u8868\u73b0\u51fa\u6765\uff0c\u56e0\u6b64\u4f5c\u8005\u6d4b\u91cf\u4e86\u5728\u586b\u5145\u56e0\u5b50\u5206\u522b\u4e3a1\u30012\u30013\u65f6Chern\u6570\u5206\u522b\u4e3a3\u30012\u30011\u7684Chern\u7edd\u7f18\u5b50\u72b6\u6001\u76f8\u5bf9\u5e94\u7684\u80fd\u9699\uff0c\u6253\u7834\u4e86MATBG\u7684Hofstadter\u8774\u8776\u5149\u8c31\u3002\u6b64\u5916\uff0c\u4f5c\u8005\u8fd8\u540c\u65f6\u6d4b\u91cf\u7535\u963b\u7387\u548c\u5316\u5b66\u52bf\u53ef\u63d0\u4f9b\u5947\u5f02\u91d1\u5c5e\u72b6\u6001\u4e0bMATBG\u968f\u6e29\u5ea6\u53d8\u5316\u7684\u7535\u8377\u6269\u6563\u6027\uff0c\u800c\u4e4b\u524d\u7684\u62a5\u9053\u4ec5\u5728\u8d85\u51b7\u539f\u5b50\u4e2d\u63a2\u7d22\u4e86\u8be5\u91cf\u3002\u8be5\u7814\u7a76\u5de5\u4f5c\u4f7f\u6211\u4eec\u66f4\u63a5\u8fd1\u4e8e\u4e00\u4e2a\u65e0\u6846\u67b6\u7684\u6846\u67b6\uff0c\u800c\u8be5\u6846\u67b6\u53ef\u4ee5\u7406\u89e3\u6709\u65e0\u78c1\u573a\u7684MATBG\u62d3\u6251\u5e26\u4e2d\u7684\u76f8\u4e92\u4f5c\u7528\u3002\u7814\u7a76\u6210\u679c\u4ee5\u9898\u4e3a\u201cFlavour Hund\u2019s coupling, Chern gaps and charge diffusivity in moir\u00e9 graphene\u201d<\/strong>\u53d1\u5e03\u5728\u56fd\u9645\u8457\u540d\u671f\u520aNature<\/strong>\u4e0a\u3002<\/p>\n

\u3010\u56fe\u6587\u89e3\u8bfb\u3011<\/strong><\/p>\n

\u56fe\u4e00\u3001\u5668\u4ef6\u7ed3\u6784\u548c\u5316\u5b66\u52bf\u6d4b\u91cf\u6f14\u793a<\/strong>
\n \"\"\uff08a\uff09\u6d4b\u91cf\u6280\u672f\u793a\u610f\u56fe;<\/p>\n

\uff08b\uff09\u5f02\u8d28\u7ed3\u6784\u7684\u80fd\u5e26\u56fe\uff0c\u663e\u793aMATBG\uff08\u03bcMATBG<\/sub>\uff09\u548cMLG\uff08\u03bcMLG<\/sub>\uff09\u7684\u5316\u5b66\u52bf\u3001\u80cc\u6805\u7535\u538bV<\/em>bg<\/sub>\u548c\u9876\u6805\u7535\u538bV<\/em>tg<\/sub>\u4e0e\u9759\u7535\u52bf\u964dV<\/em>0<\/sub>\u3001V<\/em>1<\/sub>\u548cV<\/em>2<\/sub>\u95f4\u7684\u5173\u7cfb\uff1b<\/p>\n

\uff08c\uff09MLG\u7684\u4f20\u8f93\u7279\u6027\uff0c\u663e\u793a\u4e00\u4e2a\u76f8\u5bf9\u4e8eMLG\u8f7d\u6d41\u5b50\u5bc6\u5ea6nMLG<\/sub>\u7684\u5c16\u9510\u7535\u963b\u5cf0\uff0c\u534a\u5cf0\u5168\u5bbd\u5c0f\u4e8e3\u00d7109<\/sup> cm-2<\/sup>\uff1b<\/p>\n

\uff08d\uff09MATBG\u7684\u8fd0\u8f93\u7279\u5f81\uff1b<\/p>\n

\uff08e-f\uff09MLG\u548cMATBG\u7535\u963b\u7684\u7ec4\u5408\u56fe\uff0c\u7531\u7d2b\u8272\u548c\u6a59\u8272\u8272\u6807\u8868\u793a\uff0c\u5e76\u8986\u76d6\u5728\u76f8\u540c\u7684\u8f74\u4e0a\u3002<\/p>\n

\u56fe\u4e8c\u3001MATBG\u7684\u5316\u5b66\u52bf\u4e0e\u6e29\u5ea6\u548c\u9762\u5185\u78c1\u573a\u7684\u5173\u7cfb<\/strong>
\n \"\"\uff08a\uff09\u4f7f\u7528MLG\u7684CNP\u611f\u5e94MATBG\u7684\u5316\u5b66\u52bf\uff1b<\/p>\n

\uff08b\uff09\u8bc4\u4f30\u5177\u6709\u5404\u79cd\u5e93\u4ed1\u6392\u65a5\u80fdU\u548c\u4ea4\u6362\u80fdJ\u7684\u5316\u5b66\u52bf\u7684\u5e73\u5747\u573a\uff0c\u4ee5\u5355\u7c92\u5b50\u5e26\u5bbdW=1\u4e3a\u5355\u4f4d\uff1b<\/p>\n

\uff08c\uff09\u5728\u03bd=1\u65f6\uff0c\u76f8\u4e92\u4f5c\u7528\u9a71\u52a8\u7684\u5316\u5b66\u52bf\u7a33\u5b9a\u7684\u56fe\u89e3\uff1b<\/p>\n

\uff08d\uff09\u5229\u7528MLG CNP\u63a2\u6d4b\u5230\u7684MATBG\u4eceT<\/em>=2 K\u5230T<\/em>=70 K\u7684\u5316\u5b66\u52bf\u7684\u6e29\u5ea6\u4f9d\u8d56\u6027\uff1b<\/p>\n

\uff08e\uff09\u5728N=1 MLG Landau\u80fd\u7ea7\u4e0b\uff0c\u5728T<\/em>=4 K\u548cB\u22a5<\/sub>=0.7 T\u65f6MATBG\u7684\u5316\u5b66\u52bf\u4e0e\u5e73\u9762\u78c1\u573aB\u2032\u7684\u5173\u7cfb\uff1b<\/p>\n

\uff08f\uff09\u653e\u5927\u540e\u7684\u5316\u5b66\u52bf\u548c\u4f20\u8f93\u963b\u529b\u653e\u5927\u4ee5\u8fdb\u884c\u6bd4\u8f83\uff0c\u5176\u4e2d\u03bd=+1\u3001+2\u3002<\/p>\n

\u56fe\u4e09\u3001\u5728\u5782\u76f4\u78c1\u573a\u4e2d\u63a2\u6d4bMATBG\u7684\u76f8\u5173Chern\u5e26\u9699<\/strong>
\n \"\"\uff08a-b\uff09MATBG\u4e2d\u57280-6 T<\/em>\u8303\u56f4\u5185\u7684\u5316\u5b66\u52bf\u76f8\u5bf9\u4e8e\u03bd\u7684\u5b9e\u9a8c\u548c\u6a21\u62df\uff1b<\/p>\n

\uff08c\uff09\u626d\u66f2\u53cc\u5c42\u77f3\u58a8\u70ef\uff08TBG\uff09\u7684Hofstadter\u8774\u8776\u5149\u8c31\uff0c\u6bcf\u5355\u4f4d\u6676\u80de\u7684\u901a\u91cf\u4e3a\u03d50<\/sub>\/2\uff1b<\/p>\n

\uff08d\uff09\u5229\u7528\u901a\u91cf\u4e3a\u03d50<\/sub>\/6\u7684\u5e93\u4ed1\u6392\u65a5\u548c\u4ea4\u6362\u76f8\u4e92\u4f5c\u7528\u7684\u5747\u573a\u6a21\u578b\u8ba1\u7b97\u7684TBG\u7684\u603bChern\u6570\u3002<\/p>\n

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\n \"\"\uff08a-b\uff09MATBG\u76f8\u5bf9\u4e8e\u03bd\u548cT\u7684\u7535\u963b\u7387\u548c\u53cd\u7535\u5b50\u538b\u7f29\u7387\u03c7-1<\/sup>=d<\/em>\u03bc\/d<\/em>n\uff1b<\/p>\n

\uff08c\uff09\u5728\u76f8\u5173\u72b6\u6001\u5468\u56f4\u7684\u4e00\u7cfb\u5217\u5bc6\u5ea6\u8303\u56f4\u5185\u7684\u7535\u963b\u7387-\u6e29\u5ea6\u7ebf\u6027\u884c\u4e3a\uff0c\u800c\u659c\u7387\u5bf9\u03bd\u7684\u4f9d\u8d56\u6027\u5f88\u5c0f\uff1b<\/p>\n

\uff08d\uff09\u03c7-1<\/sup>\u7684\u7ebf\u5207\u5272\u5bf9T\u7684\u4f9d\u8d56\u6027\u4e0d\u5927\uff1b<\/p>\n

\uff08e\uff09\u6709\u6548\u6269\u6563\u7387D*=\u03c7-1<\/sup>\/[e2<\/sup>(\u03c1-\u03c10<\/sub>)]\uff0c\u5176\u4e2d\u03c10<\/sub>\u662f\u901a\u8fc7\u62df\u5408T\u7ebf\u6027\u8303\u56f4\u5e76\u5916\u63a8\u5230T=0\u83b7\u5f97\uff1b<\/p>\n

\uff08f\uff091\/D*\u663e\u793a\u7ebf\u6027\u8d8b\u52bf\u662fT\u7684\u51fd\u6570\u3002<\/p>\n

\u6587\u732e\u94fe\u63a5\uff1aFlavour Hund\u2019s coupling, Chern gaps and charge diffusivity in moir\u00e9 graphene<\/a><\/strong>. Nature<\/em>, 2021<\/strong>, DOI: 10.1038\/s41586-021-03366-w.<\/p>\n

\u672c\u6587\u7531CQR\u7f16\u8bd1\u3002<\/p>\n

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