Kua puta te ahunga whakamua i roto i te rangahau i te nekehanga tino tere o ngā matūriki Weil e whakahaerehia ana engā taiaho
I ngā tau tata nei, kua noho te rangahau ariā me te rangahau whakamātautau mō ngā āhua irahiko topological me ngā rauemi irahiko topological hei kaupapa wera i roto i te ao ahupūngao matū whakapoto. Hei ariā hou mō te whakarōpūtanga matū, ko te raupapa topological, pērā i te ōritetanga, he ariā taketake i roto i te ahupūngao matū whakapoto. Ko te māramatanga hohonu ki te topology e pā ana ki ngā raruraru taketake i roto i te ahupūngao matū whakapoto, pērā i te hanganga hiko taketake ongā wāhanga matū, ngā whakawhiti wāhanga irahiko me te whakaohooho o ngā huānga maha kua kore e nekeneke i roto i ngā wāhanga irahiko. I roto i ngā rauemi topological, ko te hononga i waenga i ngā nekehanga maha o te herekoretanga, pērā i ngā irahiko, ngā phonon me te spin, he mahi nui ki te mārama me te whakahaere i ngā āhuatanga o te rauemi. Ka taea te whakamahi i te whakaohooho mārama hei wehewehe i waenga i ngā taunekeneke rerekē me te whakahaere i te āhua o te matū, ā, ka taea te whiwhi mōhiohio mō ngā āhuatanga ā-tinana taketake o te rauemi, ngā whakawhiti wāhanga hanganga, me ngā āhua irahiko hou. I tēnei wā, ko te whanaungatanga i waenga i te whanonga makaro o ngā rauemi topological e peia ana e te mara mārama me ō rātou hanganga ngota moroiti me ngā āhuatanga hiko kua noho hei whāinga rangahau.
He hononga tata te whanonga urupare hikohiko o ngā rauemi topological ki tōna hanganga hiko moroiti. Mō ngā konganuku haurua topological, he tino tairongo te whakaoho kawe tata ki te whakawhitinga roopu ki ngā āhuatanga mahi ngaru o te pūnaha. Mā te ako i ngā āhuatanga whatu kore-raina i roto i ngā konganuku haurua topological ka taea te āwhina i a tātou ki te mārama ake ki ngā āhuatanga ā-tinana o ngā āhua whakaoho o te pūnaha, ā, e tika ana kia whakamahia ēnei pānga ki te hanga ongā taputapu whatume te hoahoa o ngā pūtau rā, e whakarato ana i ngā tono mahi pea ā muri ake nei. Hei tauira, i roto i te haurua-konganuku Weyl, mā te mimiti i te photon o te mārama porowhita-polarized ka huri te hurihanga, ā, kia tutuki ai te tiakitanga o te nekehanga koki, ka tohatohahia te whakaoho irahiko i ngā taha e rua o te koeko Weyl i te ahunga o te horapa mārama porowhita-polarized, e kiia nei ko te ture kōwhiringa chiral (Pikitia 1).
Ko te ako ariā o ngā āhuatanga whatu kore-raina o ngā rauemi topological e whakamahi ana i te tikanga whakakotahi i te tatau i ngā āhuatanga whenua o te rauemi me te tātaritanga ōrite. Heoi, he hapa kei tēnei tikanga: kāore i a ia ngā mōhiohio hihiri wā-tūturu o ngā kaikawe hihiri i roto i te wāhi nekehanga me te wāhi tūturu, ā, kāore e taea te whakarite i tētahi whakataurite tika ki te tikanga kimi whakamātautau kua whakatauhia e te wā. Kāore e taea te whakaaro ki te hononga i waenga i ngā irahiko-phonon me ngā photon-phonon. Ā, he mea nui tēnei kia puta ai ētahi whakawhiti wāhanga. Hei tāpiri, kāore e taea e tēnei tātaritanga ariā i runga i te ariā raruraru te aro ki ngā tukanga ā-tinana i raro i te mara mārama kaha. Ka taea e te whakatauira hihiri ngota mahi ā-wā-ti'aturi ki te kiato (TDDFT-MD) i runga i ngā mātāpono tuatahi te whakaoti i ngā raruraru o runga ake nei.
Nō nā tata nei, i raro i te arataki a te kairangahau a Meng Sheng, te kairangahau paerua a Guan Mengxue me te tauira paerua a Wang En o te Rōpū SF10 o te Whare Taiwhanga Matua o te Ahupūngao Mata o te Whare Wānanga Ahupūngao o te Whare Wānanga Pūtaiao Hainamana/Pokapū Rangahau ā-Motu o Beijing mō te Ahupūngao Matū Kukū, i te mahi tahi me Ahorangi Sun Jiatao o te Whare Wānanga Hangarau o Beijing, i whakamahia e rātou te pūmanawa whakatauira hihiri āhua whakahihiri TDAP i whakawhanakehia e rātou anō. Ka rangahaua ngā āhuatanga urupare o te whakahihiri quastiparticle ki te taiaho tino tere i roto i te momo tuarua o te Weyl semi-metal WTe2.
Kua whakaaturia ko te whakaoho whiriwhiri o ngā kaikawe e tata ana ki te pūwāhi Weyl ka whakatauhia e te ture ōrite ā-porowhita ngota me te ture kōwhiringa whakawhiti, he rerekē tēnei i te ture kōwhiringa takahuri noa mō te whakaoho chiral, ā, ka taea te whakahaere i tōna ara whakaoho mā te whakarerekē i te ahunga pōraritanga o te mārama pōraritanga rārangi me te pūngao photon (Pikitia 2).
Mā te whakaoho kore-taurite o ngā kaikawe ka puta ngā iahiko whakaahua i ngā ahunga rerekē i te wāhi tūturu, ka pā ki te ahunga me te taurite o te paheke ā-paparanga o te pūnaha. Nā te mea he tino whakawhirinaki ngā āhuatanga āhua o WTe2, pērā i te maha o ngā pūwāhi Weyl me te nui o te wehenga i te wāhi nekehanga, ki te taurite o te pūnaha (Pikitia 3), mā te whakaoho kore-taurite o ngā kaikawe ka puta he whanonga rerekē o ngā matūriki Weyl i te wāhi nekehanga me ngā huringa e rite ana ki ngā āhuatanga āhua o te pūnaha. Nō reira, ka whakaratohia e te rangahau he tūtohi āhua mārama mō ngā whakawhiti āhua whakaahua-taurite (Pikitia 4).
E whakaatu ana ngā hua me aro atu ki te chirality o te whakaoho kawe tata ki te pūwāhi Weyl, ā, me tātarihia ngā āhuatanga porowhita ngota o te mahi ngaru. He rite tonu ngā pānga o te rua engari he rerekē te tikanga, e whakarato ana i tētahi pūtake ariā hei whakamārama i te motuhaketanga o ngā pūwāhi Weyl. Hei tāpiri, ka taea e te tikanga tātai i whakamahia i roto i tēnei rangahau te mārama hohonu ki ngā taunekeneke uaua me ngā whanonga hihiri i ngā taumata ngota me te hiko i roto i te tauine wā tino tere, te whakaatu i ā rātou tikanga moroiti-tinana, ā, e tumanakohia ana hei taputapu kaha mō ngā rangahau a meake nei mō ngā āhuatanga whatu kore-raina i roto i ngā rauemi topological.
Kei roto i te puka Nature Communications ngā hua. E tautokona ana te mahi rangahau e te National Key Research and Development Plan, te National Natural Science Foundation me te Strategic Pilot Project (Category B) o te Chinese Academy of Sciences.
PIK.1.a. Te ture kōwhiringa chirality mō ngā pūwāhi Weyl me te tohu chirality pai (χ=+1) i raro i te mārama porowhita-polarized; Te whakaoho whiriwhiri nā te ōritetanga porowhita ngota i te pūwāhi Weyl o b. χ=+1 i roto i te mārama polarized ipurangi
PIK. 2. Te hoahoa hanganga ngota o a, Td-WTe2; b. Te hanganga roopu e tata ana ki te mata o Fermi; (c) Te hanganga roopu me ngā takoha whanaunga o ngā porowhita ngota e tohatohahia ana i ngā rārangi ōrite teitei i te rohe o Brillouin, ko ngā pere (1) me (2) e tohu ana i te whakaoho tata, i tawhiti rānei i ngā pūwāhi Weyl; d. Te whakanui ake i te hanganga roopu i te ahunga Gamma-X
PIK.3.ab: Ko te nekehanga ā-paparanga whanaunga o te ahunga whakapolarisasi mārama kua whakapōraruhia i te tuaka-A me te tuaka-B o te karaihe, me te aratau nekehanga e rite ana kua whakaaturia; C. Whakataurite i waenga i te whakatauira ariā me te mātakitaki whakamātautau; de: Te whanaketanga ōrite o te pūnaha me te tūranga, te maha me te nekehanga o te wehenga o ngā pūwāhi Weyl tata e rua i te papa kz=0
PIK. 4. Te whakawhiti āhua whakaahua i roto i te Td-WTe2 mō te pūngao photon mārama kua whakapōraruhia rārangi (?) ω) me te tūtohi āhua e whakawhirinaki ana ki te ahunga pōraru (θ)
Wā tuku: Hepetema-25-2023