Inqubekela phambili yenziwe esifundweni se-Ultrafast Motion of Weil Quasiparticles alawulwa yiamachweba
Eminyakeni yamuva nje, ucwaningo lwe-theory kanye nelokuhlola ezifundazweni ze-topological kanye nezinto zokwelashwa ze-toporigical seluphenduke isihloko esishisayo emkhakheni we-confendad physics. Njengomqondo omusha wokuhlukaniswa okubalulekile, ukuhleleka kwe-topological, njengokuvumelanisa, kungumqondo oyisisekelo ku-Dwelnsed Diffics. Ukuqonda okujulile kwe-topology kuhlobene nezinkinga eziyisisekelo ku-concled dresics physics, njengesakhiwo esiyisisekelo se-elekthronikhiIzigaba ze-Quantum, ukuguquka kwesigaba se-Quantum kanye nokuvuselelwa kwezinto eziningi ezingekho emthethweni ezigabeni ze-quantum. Kwezinto zokwelashwa, ukuhlanganiswa phakathi kwama-degree amaningi wenkululeko, njengama-elektroni, ama-pumples kanye ne-spin, kudlala indima enqumayo ekuqondeni nasekulaleni impahla yezinto ezibonakalayo. Ukuthokozela okukhanyayo kungasetshenziselwa ukuhlukanisa phakathi kokuxhumana okuhlukile futhi kukhohlise isimo sendaba, kanye nemininingwane mayelana nezakhiwo eziyisisekelo zomzimba, izinguquko zesigaba sesakhiwo, kanye nezindawo ezintsha ze-quantum zingatholakala. Njengamanje, ubudlelwano phakathi kokuziphatha kwe-macroscopic kwezinto zokwelashwa eziqhutshwa inkambu ekhanyayo kanye nesakhiwo sazo se-athomu se-microscopic kanye nezakhiwo ze-elekthronikhi sekuphenduke umgomo wokucwaninga.
Ukuziphatha kokuphendula kwe-PhotoElectric kwezinto zokwelashwa kuhlobene kakhulu nesakhiwo saso se-Microscopic. Kwama-semi-semi-metha e-topological, i-carrier experity eduze komgwaqo weqembu lizwela kakhulu izici zomsebenzi we-wave of the system. Ukufundwa kwe-nonlinear optical izehlakalo kwezinsimbi ze-semi-metals kungasisiza ukuba siqonde kangcono izakhiwo ezibonakalayo zezindawo ezijabulayo zohlelo, futhi kulindeleke ukuthi le miphumela ingahle isetshenziswe ekwenziweni kweAmadivayisi we-Opticalkanye nokwakhiwa kwamangqamuzana elanga, ukuhlinzeka ngezicelo ezingokoqobo ezingokoqobo ngokuzayo. Isibonelo, ku-semi-metal ye-Weyl, ukudonsa i-Photon yokukhanya okukhalweni okuyisilinganiselwayo kuzodala ukuthi i-spin ihlele, futhi ukuze ihlangabezane nokulondolozwa kokusakazwa kwe-angularited ngokulinganayo, okubizwa ngokuthi yi-chiral Selection Rule (Umdwebo 1).
Ukutadisha okungokweqiniso kwe-nonlinear optical denomena yezinto zokwelashwa ezivame ukwamukela indlela yokuhlanganisa ukubalwa kwezibalo zezinto ezibonakalayo zombuso kanye nokuhlaziywa kokuvumelanisa. Kodwa-ke, le ndlela inezinkinga ezithile: Intula imininingwane enamandla yesikhathi sangempela yabathwali abajabulayo endaweni yesikhashana kanye nendawo yangempela, futhi ayikwazi ukusungula ukuqhathanisa okuqondile nesikhathi esinqunyelwe isikhathi sokuthola isikhathi. Ukuhlanganiswa phakathi kwezikhathi ze-elektroni kanye ne-photon-khalazi ngeke kubhekwe. Futhi lokhu kubalulekile ukuze kuguqulwe okuthile kwesigaba. Ngaphezu kwalokho, lokhu kuhlaziywa kwethiyori kususelwa embuyweni ye-perturbation akunakubhekana nezinqubo zomzimba ngaphansi kwensimu ekhanyayo eqinile. I-density desnity exhemule desnsics esebenza ama-moleculal (TDDFT-MD) asungula izimiso zokuqala angaxazulula izinkinga ezingenhla.
Muva nje, ngaphansi kokuholwa ngumcwaningi uMeng Sheng, umcwaningi we-postdoctol Guan Mengcue kanye ne-Factoctal Student Wang ekwiqembu le-SF10 ye-Chinese Physics of the Beijing Institute of Technitute of Technology I-TDAP. Izici zokuphendula zokuvuselelwa kwezinhlathihla ze-quastiparticle ku-laser ye-ultrafast ngohlobo lwesibili lwe-Weyl semi-metal WTE2 iyaphenywa.
Kuboniswe ukuthi ukuthokozela okukhethiwe kwezithwali eduze kwe-Weyl Point kunqunywa yi-atomic orbital Symyry kanye ne-Transy Ukukhetha umthetho, futhi indlela yayo yokukhetha ihlukile ngokushintsha ukuqondisa kombala we-Chirarized ngokukhanya okusobala kanye ne-Photon Energy (Fig. 2).
Ukuvuselelwa kwe-asymmetric kwe-carriers kuhlobisa ama-PhotoCurents ngezindlela ezihlukile esikhaleni sangempela, esithinta ukuqondiswa kanye nokulinganisa kwesiliphu sokuhlasela kwesistimu. Kusukela izakhiwo ze-topological ze-WTE2, njengenombolo yamaphuzu we-Weyl kanye ne-degree yokuhlukaniswa kwesikhala, kuncike kakhulu ekuziphatheni kohlelo (umdwebo 3), ukuhanjiswa kwe-asymmetric kuzoletha ngokuziphatha okuhlukile kwama-amelm quastiples ngesikhala se-amentum. Ngakho-ke, isifundo sinikeza umdwebo wesigaba esicacile wokuguqulwa kwesigaba se-Phototopological (Umdwebo 4).
Imiphumela ikhombisa ukuthi ama-chirality wokuxolelwa kwenkampani yenethiwekhi eduze kwe-Weyl Point kufanele anake, futhi izakhiwo ze-atomic orbital zomsebenzi wave kufanele zihlaziywe. Imiphumela yalaba bobabili iyafana kepha kusobala ukuthi inqubo yehlukile, enikeza isisekelo sethiyori sokuchaza ubuhlanga lwamaphoyinti we-Weyl. Ngaphezu kwalokho, indlela yokuqokwa yenkomo eyamukelwe kulolu cwaningo ingakuqonda ngokujulile ukusebenzisana okuyinkimbinkimbi kanye nokuziphatha okunamandla kuma-athomu nama-elekthronikhi ngesilinganiso sesikhathi esisheshayo, kulindeleke ukuthi kube yithuluzi elinamandla lokucwaninga ngesikhathi esizayo ku-Nonlinear Optical Demomena kwezinto ezingokwezifundo.
Imiphumela iku-Journal Natural Communications. Umsebenzi wokucwaninga usekelwa nguNational Key Research and Development Plan, i-National Natural Science Foundation kanye ne-Strategic Pilot Project (Isigaba B) sesiShayina Academy of Science.
Fig.1.a. Umthetho wokukhethwa kweChirality wamaphoyinti we-Weyl ngesibonakaliso esihle se-chirality (χ = 1) ngaphansi kokukhanya okukhalweni okuyisilinganiso; Ukufundwa okukhethiwe ngenxa ye-atomic orbital symmetry ephuzwini le-Weyl le-B. χ = + 1 ku-on-line poliarised Light
Fig. 2. I-atomic yesakhiwo somdwebo we, TD-WTE2; b. Isakhiwo se-band eduze komphezulu we-fermi; . d. I-Amplification yesakhiwo se-band eceleni kwe-GAMMA-X yokuqondisa
I-Fig.3.B: Ukuhamba kwe-interlayer okuhlobene nokuqondisa okukhanyayo okukhanyayo okhalweni olukhanyayo ngokulandelana kwe-a-axis kanye ne-b-axis yekristalu, futhi imodi yokunyakaza ehambisanayo iyaboniswa; C. ukuqhathanisa phakathi kokulingisa kwethiyori nokubukwa kokuhlola; De: Ukuguqulwa kwe-Symmetry kohlelo kanye nesikhundla, inombolo kanye nezinga lokuhlukaniswa kwamaphoyinti amabili asondele kakhulu we-Weyl ku-KZ = 0 Plane
Fig. 4
Isikhathi sePosi: Sep-25-2023