Sabuwar duniyar na'urorin lantarki na optoelectronic

Sabuwar duniya tana'urorin lantarki na optoelectronic

Masu bincike a Cibiyar Fasaha ta Technion-Israel sun ƙirƙiro wani tsari mai tsari wanda aka tsara shi da inganci.Laser na ganibisa ga wani yanki na atomic guda ɗaya. Wannan gano ya yiwu ne ta hanyar hulɗa mai jituwa tsakanin wani yanki na atomic guda ɗaya da kuma wani layi mai iyaka na photonic spin lattice, wanda ke tallafawa wani kwarin juyawa mai girma-Q ta hanyar rabawa na photons na yanayin da aka ɗaure a cikin ci gaba.
Sakamakon, wanda aka buga a cikin Nature Materials kuma aka haskaka shi a cikin taƙaitaccen bincikensa, yana share hanyar nazarin abubuwan da suka shafi juyi masu jituwa a cikin gargajiya da na gargajiya.tsarin kwantum, kuma yana buɗe sabbin hanyoyi don bincike na asali da aikace-aikacen juyawar electron da photon a cikin na'urorin optoelectronic. Tushen gani na juyawa yana haɗa yanayin photon tare da canjin electron, wanda ke ba da hanya don nazarin musayar bayanai na juyawa tsakanin electrons da photons da haɓaka na'urorin optoelectronic na zamani.

Ana gina ƙananan ramuka na gani na Spin Valley ta hanyar haɗa layukan juyawa na photonic tare da rashin daidaituwar juyawa (yankin rawaya na tsakiya) da kuma daidaiton juyawa (yankin cyan cladding).
Domin gina waɗannan majiyoyi, akwai buƙatar kawar da lalacewar juyawa tsakanin yanayin juyawa biyu masu adawa a cikin ɓangaren photon ko electron. Yawanci ana samun wannan ta hanyar amfani da filin maganadisu a ƙarƙashin tasirin Faraday ko Zeeman, kodayake waɗannan hanyoyin galibi suna buƙatar ƙarfin filin maganadisu kuma ba za su iya samar da microsource ba. Wata hanyar da za ta yi kyau ta dogara ne akan tsarin kyamarar geometric wanda ke amfani da filin maganadisu na wucin gadi don samar da yanayin juyawa na photons a cikin sararin motsi.
Abin takaici, abubuwan da aka lura a baya game da yanayin rarrabuwar juyi sun dogara sosai kan hanyoyin yaɗuwar abubuwan da ba su da yawa, waɗanda ke haifar da ƙuntatawa mai tsanani akan daidaiton sarari da na ɗan lokaci na tushe. Wannan hanyar kuma tana da nasaba da yanayin sarrafa juyi na kayan laser masu toshewa, waɗanda ba za a iya amfani da su ko kuma ba za a iya amfani da su cikin sauƙi don sarrafa aiki ba.tushen haske, musamman idan babu filayen maganadisu a zafin ɗaki.
Domin cimma yanayin da ke raba juyi mai girma-Q, masu binciken sun gina layukan juyawa na photonic tare da daidaito daban-daban, gami da tsakiya mai rashin daidaito na juyi da kuma ambulan similar juyi wanda aka haɗa shi da Layer ɗaya na WS2, don samar da kwaruruka masu iyaka a gefe. Latsi mai rashin daidaituwa na asali wanda masu binciken ke amfani da shi yana da muhimman halaye guda biyu.
Vektor mai juyi mai juyi wanda ke da ikon sarrafawa wanda ya samo asali daga bambancin sararin samaniya na nau'ikan nanoporous iri-iri na anisotropic da suka haɗa su. Wannan vektor yana raba ɓangaren juyi zuwa rassan da aka juya zuwa rassa biyu masu juyi a cikin sararin motsi, wanda aka sani da tasirin photonic Rushberg.
Wasu nau'ikan yanayin da ke da alaƙa mai tsayi da Q (quasi) a cikin ci gaba, wato ±K (Brillouin band Angle) kwarin juyawa na photon a gefen rassan da ke raba juyawa, suna samar da haɗin kai mai daidaituwa na girman daidai.
Farfesa Koren ya lura: “Mun yi amfani da WS2 monolides a matsayin kayan riba saboda wannan disulfide na ƙarfe mai canzawa kai tsaye yana da wani nau'in pseudo-spin na kwarin kuma an yi nazari sosai a matsayin madadin mai ɗaukar bayanai a cikin electrons na kwarin. Musamman, excitons ɗin kwarin su na ±K (wanda ke haskakawa a cikin nau'in masu fitar da dipole mai juyawa) za a iya zaɓar su ta hanyar hasken da aka juya-polarized bisa ga ƙa'idodin zaɓin kwatancen kwarin, don haka suna sarrafa juyawar da ba ta da magnetism.tushen gani.
A cikin wani ƙaramin rami mai haɗakar kwarin spin mai layi ɗaya, ana haɗa excitons na ±K 'kwarin zuwa yanayin kwarin spin ±K ta hanyar daidaitawar polarization, kuma ana gano laser na spin exciton a zafin ɗaki ta hanyar amsawar haske mai ƙarfi. A lokaci guda,laserTsarin yana jagorantar excitons na kwarin ±K mai zaman kansa na farko don nemo mafi ƙarancin asarar tsarin da kuma sake kafa alaƙar kulle-kulle bisa ga yanayin lissafi da ke gaban kwarin juyawa na ±K.
Daidaito tsakanin kwarin da wannan tsarin laser ke jagoranta ya kawar da buƙatar rage ƙarancin zafin jiki na watsawa akai-akai. Bugu da ƙari, ana iya daidaita mafi ƙarancin yanayin asarar laser monolayer na Rashba ta hanyar layi (da'ira) polarization na famfo, wanda ke ba da hanyar sarrafa ƙarfin laser da haɗin kai na sarari.
Farfesa Hasman ya bayyana: "An bayyana labarinphotonicTasirin kwarin spin Rashba yana ba da wata hanya ta gaba ɗaya don gina tushen gani mai fitar da haske. Haɗin kwarin da aka nuna a cikin ƙaramin ramin spin valley mai layi ɗaya yana kawo mana mataki ɗaya kusa da cimma haɗakar bayanai tsakanin ±K 'valley excitons ta hanyar qubits.
Tun da daɗewa, ƙungiyarmu ta daɗe tana haɓaka na'urorin hangen nesa na juyawa, suna amfani da na'urar hangen nesa ta photon a matsayin kayan aiki mai tasiri don sarrafa halayen raƙuman lantarki. A cikin 2018, saboda sha'awar kwarin-zuwa-zuwa-kwari a cikin kayan girma biyu, mun fara wani aiki na dogon lokaci don bincika ikon sarrafa tushen hasken atom ba tare da filayen maganadisu ba. Muna amfani da samfurin lahani na matakin Berry wanda ba na gida ba don magance matsalar samun yanayin geometric mai daidaituwa daga exciton kwarin guda ɗaya.
Duk da haka, saboda rashin ingantaccen tsarin daidaitawa tsakanin excitons, babban haɗin kai na excitons da yawa a cikin tushen hasken Rashuba mai layi ɗaya wanda aka cimma har yanzu ba a warware shi ba. Wannan matsalar tana ƙarfafa mu mu yi tunani game da samfurin Rashuba na babban photons na Q. Bayan ƙirƙirar sabbin hanyoyin zahiri, mun aiwatar da laser mai layi ɗaya na Rashuba da aka bayyana a cikin wannan takarda.
Wannan nasarar ta share fagen nazarin abubuwan da suka shafi daidaituwar juyi a fannoni na gargajiya da na quantum, kuma ta buɗe sabuwar hanya don bincike na asali da amfani da na'urorin optoelectronic na spintronic da photonic.