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楂樼瓑鏁欒偛闋樺煙鏁�(sh霉)瀛楀寲缍滃悎鏈嶅嫏骞宠嚭
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鏉卞崡澶у
2021-04-11
鍦�浜�缍嫇鎾叉潗鏂橫oTe2涓櫦(f膩)鐝�(xi脿n)鍏夋縺鐧�(f膩)瑾樺皫鐨勪簽鐨鏅傞枔灏哄害绲愭鐩歌畩
MoTe2鏄敱MoTe6鍏潰楂旂祼妲嬪柈鍏冩鎴愮殑鍘熷瓙灞ゆ部c鏂瑰悜鍫嗙枈褰㈡垚鐨勪簩缍潗鏂欑郴绲�(t菕ng)锛屼笉鍚岀殑鍫嗙枈鏂瑰紡鍏锋湁涓嶅悓鏅堕珨灏嶇ū鎬�銆�1T-MoTe2鍦ㄥ婧檪鏄柈鏂滅殑1T鈥欑浉锛岄毃钁楁韩搴﹂檷浣庡湪250K鏅傜櫦(f膩)鐢熺祼妲嬬浉璁�锛岃綁璁婃垚姝ｄ氦鐨凾_d鐩革紝鍏朵腑鍙互瀛樺湪绗簩椤炲鐖捐不绫冲瓙銆傜帇妤犳灄瑾查绲勯€氶亷瀵﹂鐧�(f膩)鐝�(xi脿n)楂樺挤搴︾殑杩戠磪澶栨縺鍏夎剤娌栧彲浠ュ湪浜炵毊绉掓檪闁撳昂搴﹀収(n猫i)灏囦腑蹇冨弽婕斿皪绋辨€х牬缂虹殑T_d鐩搁﹨(q奴)鍕曞埌鍏锋湁涓績鍙嶆紨灏嶇ū鐨�1T鈥欑浉銆傝┎鐩歌畩鐧�(f膩)鐢熺殑鏈€鏄庨’鐨勭壒寰佹槸鏅傞枔鍒嗚鲸鐨勫弽灏勭巼璁婂寲涓┇鍚戝壀鍒囨尟钑╄伈瀛愮殑娑堝け鍜屼簩娆¤娉㈠挤搴︾殑鎬ュ妵涓嬮檷銆傞€氶亷閬告搰鍜屾敼璁婃縺鐧�(f膩)鑴堟矕鐨勮剤瀵拰娉㈤暦锛屽緸瀵﹂涓婃帓闄や簡婵€鍏夊姞鐔辨晥鎳�銆傝┎闋呯爺绌堕娆″湪瓒呭揩浜炵毊绉掑昂搴﹀収(n猫i)瀵︾従(xi脿n)浜嗘縺鍏夎獦灏庣殑闈炲姞鐔辨晥鎳夊紩璧风殑MoTe2鏅堕珨涓浜岄Weyl鍗婇噾灞浉鑸囨甯稿崐閲戝爆鐩哥殑瓒呭揩绲愭鐩歌畩銆傚畠鐐鸿秴蹇縺鍏夋帶鍒跺浐楂旂殑鎷撴挷鐗规€ч枊杈熶簡鏂扮殑鍙兘鎬э紝浣胯秴蹇縺鍏夋縺鐧�(f膩)鐨勬嫇鎾查枊闂滃櫒浠跺叿鏈夋經鍦ㄧ殑瀵﹂殯鎳夌敤鍍瑰€�銆� 瑭插伐浣滀簬2019骞�5鏈�22鏃ュ湪绶氱櫦(f膩)琛ㄤ簬钁楀悕瀛歌鏈熷垔Physical Review X锛圥hys. Rev. X 9, 021036 (2019)锛�锛岀涓€浣滆€呯偤閲忓瓙鏉愭枡涓績鍗氬＋鐢熷嫉澶㈢懁锛岀帇妤犳灄鏁欐巿鍜屽叾鐮旂┒绲勭殑钁ｆ郡鍗氬＋鏄€氳▕浣滆€�锛岄噺瀛愭潗鏂欑瀛镐腑蹇冪帇鍋ユ暀鎺堢爺绌剁祫鐐鸿┎宸ヤ綔鎻愪緵浜嗘ǎ鍝併€傝┎闋呯爺绌跺緱鍒板湅瀹惰嚜鐒剁瀛稿熀閲戝鍝℃渻銆佸湅瀹堕噸榛炵爺绌堕枊鐧�(f膩)闋呯洰绛夐爡鐩殑鏀寔銆侳igure: Pump induced SHG time traces of MoTe2 at selected fluences at T=10 K. The graph shows that as the laser fluence increases, the signal of the second harmonic of the sample drops significantly. The inset is a time-resolved schematic diagram of second harmonic detection
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