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\u3010\u6210\u679c\u5bfc\u8bfb\u3011<\/p>\n

\"\"<\/p>\n

\u8fd1\u671f\uff0c\u82cf\u5dde\u5b9e\u9a8c\u5ba4\u526f\u7814\u7a76\u5458\u94c9\u4e30\u6e90\u4e0e\u65b0\u52a0\u5761\u56fd\u7acb\u5927\u5b66Su Ying Quek\u8bfe\u9898\u7ec4\u5408\u4f5c\uff0c\u53d1\u5c55\u4e86\u7b2c\u4e00\u6027\u539f\u7406GW-Bethe-Salpeter-Equation(GW-BSE)\u65b9\u6cd5\u7528\u4ee5\u8ba1\u7b97\u4e8c\u9636\u7535\u6781\u5316\u7387\u4e2d\u7684\u6fc0\u5b50\u6548\u5e94\uff0c\u7a81\u7834\u4e86\u4f20\u7edf\u975e\u7ebf\u6027\u5149\u5b66\u6027\u8d28\u8ba1\u7b97\u4e2d\u65e0\u76f8\u4e92\u4f5c\u7528\u8fd1\u4f3c\u7684\u9650\u5236\uff0c\u63ed\u793a\u4e86\u7535\u5b50-\u7a7a\u7a74\u591a\u4f53\u76f8\u4e92\u4f5c\u7528\u5bf9\u6750\u6599\u975e\u7ebf\u6027\u5149\u7535\u6027\u8d28\u7684\u91cd\u8981\u5f71\u54cd\uff0c\u5e76\u9884\u6d4b\u53cc\u6fc0\u5b50\u5171\u632f\u73b0\u8c61\u3002\u8be5\u5de5\u4f5c\u4ee5\u201cExciton-Enhanced Spontaneous Parametric Down-conversion in Two-Dimensional Crystals\u201d\u4e3a\u9898\u53d1\u8868\u5728\u671f\u520aPhysical Review Letter\u4e0a\u3002<\/p>\n

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Fig 1:\u5355\u5c42NbOX2<\/sub>\u7684\u539f\u5b50\u7ed3\u6784\u3001\u80fd\u5e26\u4e0e\u5149\u5b66\u5438\u6536\u8c31;(c e)\u4e2d\u7eff\u9ec4\u5206\u522b\u4e3aNb\u548cX\u539f\u5b50\u8f68\u9053\u6295\u5f71 (b)\u4e2d\u9ed1\/\u7ea2\/\u84dd\u7ebf\u5206\u522b\u4e3aBSE\/DFT\/\u5b9e\u9a8c\u7ed3\u679c\uff0c(d,f)\u84dd\u7ea2\u5b9e\u7ebf\u4e3aBSE\u7ed3\u679c\uff0c\u84dd\u865a\u7ebf\u4e3a\u5b9e\u9a8c\u7ed3\u679c\u3002<\/p>\n

\u4e8c\u7ef4\u6750\u6599\u4e2d\u7531\u4e8e\u7535\u5b50-\u7a7a\u7a74\u4e4b\u95f4\u7684\u5e93\u4f26\u5c4f\u853d\u6548\u5e94\u8f83\u5f31\uff0c\u56e0\u800c\u5bfc\u81f4\u6fc0\u5b50\u6001\uff08\u7535\u5b50-\u7a7a\u7a74\u5bf9\u7684\u675f\u7f1a\u6001\uff09\u7684\u5f62\u6210\u5e76\u6df1\u523b\u5f71\u54cd\u6750\u6599\u4e2d\u591a\u7535\u5b50\u4f53\u7cfb\u6fc0\u53d1\u6001\u7684\u76f8\u5173\u6027\u8d28\u3002\u4f20\u7edf\u5bc6\u5ea6\u6cdb\u51fd\u7406\u8bba\uff08DFT\uff09\u65e0\u6cd5\u51c6\u786e\u9884\u6d4b\u6fc0\u5b50\u6001\uff0c\u800c\u57fa\u4e8e\u91cf\u5b50\u591a\u4f53\u5fae\u6270\u8bba\u7684GW-BSE\u65b9\u6cd5\u901a\u8fc7\u8ba1\u7b97\u7535\u5b50-\u7a7a\u7a74\u95f4\u7684\u76f4\u63a5\u5e93\u4f26\u76f8\u4e92\u4f5c\u7528\u548c\u5c4f\u853d\u4ea4\u6362\u4f5c\u7528\u77e9\u9635\uff0c\u53ef\u51c6\u786e\u63cf\u8ff0\u91cf\u5b50\u591a\u4f53\u6fc0\u53d1\u6001\u3002\u9996\u5148\u4f5c\u8005\u9009\u53d6\u4e00\u7c7b\u65b0\u578b\u94c1\u7535\u6750\u6599\uff08\u5355\u5c42NbOX2<\/sub> X=I, Cl\uff09\uff0c\u5176\u539f\u5b50\u7ed3\u6784\u548c\u80fd\u5e26\u5982\u56fe1\u6240\u793a\u3002\u56fe1b\u4e2d\u53ef\u4ee5\u770b\u51fa\uff0c\u76f8\u8f83DFT\uff0cBSE\u5bf9\u7ebf\u6027\u5438\u6536\u8c31\u7684\u9884\u6d4b\u660e\u663e\u4e0e\u5b9e\u9a8c\u7b26\u5408\u66f4\u597d\uff0c\u8fd9\u4f53\u73b0\u51fa\u4f4e\u7ef4\u6750\u6599\u4e2d\u6fc0\u5b50\u6548\u5e94\u5bf9\u5149\u5b66\u6027\u8d28\u7684\u4e3b\u5bfc\u4f5c\u7528\u3002\u4f5c\u8005\u8fdb\u4e00\u6b65\u8ba1\u7b97\u4e86NbOI2<\/sub>\u4e8c\u6b21\u8c10\u6ce2\u4ea7\u751f\u7cfb\u6570\uff0c\u5e76\u53d1\u73b0\u4e8c\u9636\u5149\u7535\u54cd\u5e94\u4e2dBSE\u8ba1\u7b97\u7ed3\u679c\u4e0e\u5b9e\u9a8c\u6d4b\u91cf\u7ed3\u679c\u543b\u5408\uff0c\u800cDFT\u7ed3\u679c\u4e0e\u5b9e\u9a8c\u4e0d\u7b26\uff08\u56fe2d\uff09\u3002\u540c\u65f6\u8ba1\u7b97\u663e\u793a\u4e8c\u7ef4\u6750\u6599\u4e2d\u7535\u5b50-\u7a7a\u7a74\u5f3a\u76f8\u4e92\u4f5c\u7528\u5bfc\u81f4\u5176\u975e\u7ebf\u6027\u54cd\u5e94\u5b58\u5728\u660e\u663e\u6fc0\u5b50\u589e\u5f3a\u6548\u5e94\uff0c\u800c\u4e8c\u6b21\u8c10\u6ce2\u4ea7\u751f\u7cfb\u6570\u7684Lehmann\u8868\u793a\u53ef\u5206\u89e3\u51fa\u4e24\u79cd\u6fc0\u5b50\u5171\u632f\u5f62\u5f0f\uff1aw-resonance\u548c2w-resonance\uff08\u56fe2\u548c3\u4e2d\u9ed1\u7eff\u8272\u7ad6\u7ebf\uff09\u3002\u6700\u540e\u4f5c\u8005\u8ba1\u7b97\u4e86\u5355\u5c42NbOCl2<\/sub>\u6750\u6599\u4e2d\u5f71\u54cd\u5355\u5149\u5b50\u5206\u88c2\u6210\u4e24\u4f4e\u80fd\u5149\u5b50\u7684\u81ea\u53d1\u53c2\u91cf\u4e0b\u8f6c\u6362\u8fc7\u7a0b\u54cd\u5e94\u7cfb\u6570\uff08\u56fe3\uff09\uff0c\u5e76\u9884\u6d4b\u5f53\u6750\u6599\u4e2d\u4e24\u7c7b\u6fc0\u5b50\u5171\u632f\u6761\u4ef6\u540c\u65f6\u6ee1\u8db3\u65f6\uff0c\u65e2\u56fe3b\u4e2d\u9ed1\u8272\u7eff\u8272\u7ad6\u7ebf\u4ee3\u8868\u7684\u4e24\u79cd\u6fc0\u5b50\u5171\u632f\u4f4d\u7f6e\u91cd\u5408\u65f6\uff0c\u53ef\u6781\u5927\u589e\u5f3a\u81ea\u53d1\u53c2\u91cf\u4e0b\u8f6c\u6362\u6548\u7387\u3002<\/p>\n

\"\"<\/p>\n

Fig 2: (a-c) NbOI2<\/sub>\u4e8c\u6b21\u8c10\u6ce2\u4ea7\u751f\u7cfb\u6570\u7684BSE\u8ba1\u7b97\u7ed3\u679c\uff0c\u9ed1\u7ad6\u7ebf\u5206\u522b\u4e3aw-resonance\u5f3a\u5ea6\uff1b(d)\u4e8c\u6b21\u8c10\u6ce2\u4ea7\u751f\u5f3a\u5ea6\u7684\u6781\u5316\u56fe\u4e0e\u5b9e\u9a8c\u6570\u636e\u6bd4\u8f83\uff0c\u9ed1\u5b9e\u7ebf\u4e3aBSE\u7ed3\u679c\uff0c\u84dd\u865a\u7ebf\u4e3aDFT\u7ed3\u679c\uff0c\u7ea2\u6563\u70b9\u4e3a\u5b9e\u9a8c\u3002<\/p>\n

\"\"<\/p>\n

Fig 3: (a-d) NbOCl2<\/sub>\u81ea\u53d1\u53c2\u91cf\u4e0b\u8f6c\u6362\u7cfb\u6570\u7684BSE\u8ba1\u7b97\u7ed3\u679c\uff0c\u9ed1\u7eff\u7ad6\u7ebf\u5206\u522b\u4e3aw-resonance\u548c2w-resonance\u5f3a\u5ea6; (e-g)\u53cc\u6fc0\u5b50\u5171\u632f\u6761\u4ef6\u793a\u610f\u56fe\u3002<\/p>\n

\u3010\u5c0f\u7ed3\u3011<\/p>\n

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\u6587\u7ae0\u4fe1\u606f\uff1a<\/p>\n

Fengyuan Xuan, MingRui Lai, Yaze Wu, and Su Ying Quek \u201cExciton-Enhanced Spontaneous Parametric Down-conversion in Two-Dimensional Crystals\u201d, Phys. Rev. Lett. 132, 246902 (2024), https:\/\/doi.org\/10.1103\/PhysRevLett.132.246902<\/p>\n","protected":false},"excerpt":{"rendered":"

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