Izwe elisha leamadivayisi e-optoelectronic
Abacwaningi e-Technion-Israel Institute of Technology bathuthukise ukujikeleza okulawulwa ngokuhambisanayoi-laser yokukhanyangokusekelwe kungqimba olulodwa lwe-athomu. Lokhu kutholakala kwenzeke ngokusebenzisana okuhlangene okuncike ekujikeleni phakathi kwengqimba eyodwa ye-athomu kanye ne-lattice ye-photonic spin evinjelwe ngokuvundlile, esekela isigodi se-high-Q spin ngokusebenzisa ukuhlukaniswa kwe-Rashaba-type spin kwama-photon ezimo eziboshiwe ku-continuum.
Umphumela, owanyatheliswa kuyi-Nature Materials futhi waqokonyiswa emfushane yocwaningo lwawo, uvula indlela yokufunda ngezinto ezihlobene nokujikeleza ezihambisanayo ku-classical kanye ne-izinhlelo ze-quantum, futhi ivula izindlela ezintsha zocwaningo oluyisisekelo kanye nokusetshenziswa kwe-electron kanye ne-photon spin kumadivayisi e-optoelectronic. Umthombo we-spin optical uhlanganisa imodi ye-photon noshintsho lwe-electron, oluhlinzeka ngendlela yokufunda ukushintshana kolwazi lwe-spin phakathi kwama-electron nama-photon kanye nokuthuthukisa amadivayisi e-optoelectronic athuthukile.
Ama-microcavities e-Spin valley optical akhiwa ngokuxhumanisa ama-photonic spin lattices ane-inversion asymmetry (isifunda esiphuzi esiyinhloko) kanye ne-inversion symmetry (isifunda se-cyan cladding).
Ukuze kwakhiwe le mithombo, imfuneko iwukuqeda ukuwohloka kokujikeleza phakathi kwezimo ezimbili eziphikisanayo zokujikeleza engxenyeni ye-photon noma ye-electron. Lokhu kuvame ukufezwa ngokusebenzisa insimu yamagnetic ngaphansi komphumela we-Faraday noma we-Zeeman, yize lezi zindlela ngokuvamile zidinga insimu yamagnetic enamandla futhi azikwazi ukukhiqiza umthombo omncane. Enye indlela ethembisayo isekelwe ohlelweni lwekhamera yejometri olusebenzisa insimu yamagnetic yokwenziwa ukukhiqiza izimo ze-spin-split zama-photon esikhaleni se-momentum.
Ngeshwa, ukubonwa kwangaphambilini kwezimo zokuhlukaniswa kwe-spin kuye kwathembela kakhulu ezindleleni zokusabalala kwezinto eziphansi, ezibeka imingcele emibi ekuvumelaneni kwendawo kanye nesikhathi kwemithombo. Le ndlela iphinde iphazanyiswe uhlobo lokulawulwa kwe-spin kwezinto ezivimbayo ze-laser-gain, ezingeke zisetshenziswe noma ezingenakukwazi ukusetshenziswa kalula ukulawula ngenkuthalo.imithombo yokukhanya, ikakhulukazi uma kungekho mandla kazibuthe ekamelweni lokushisa.
Ukuze kufezwe izimo ze-high-Q spin-splitting, abacwaningi bakhe ama-photonic spin lattices ane-symmetries ehlukene, okuhlanganisa i-core ene-inversion asymmetry kanye ne-inversion symmetric envelope ehlanganiswe nesendlalelo esisodwa se-WS2, ukukhiqiza izigodi ze-spin ezine-laterally constrained spin. I-inversion asymmetric lattice eyisisekelo esetshenziswa abacwaningi inezakhiwo ezimbili ezibalulekile.
Ivektha ye-lattice elawulwayo ehambisana ne-spin ebangelwa ukushintshashintsha kwesikhala se-geometric se-heterogeneous anisotropic nanoporous eyakhiwe yizo. Le vektha ihlukanisa ibhendi yokudilizwa kwe-spin ibe amagatsha amabili e-spin-polarized esikhaleni se-momentum, eyaziwa ngokuthi umphumela we-photonic Rushberg.
Izimo ezimbili ezihlanganisiwe ze-Q symmetric (quasi) ephezulu ku-continuum, okungukuthi izigodi ze-photon spin ze-±K(Brillouin band Angle) emaphethelweni amagatsha ahlukanisayo e-spin, zakha i-superposition ehambisanayo yama-amplitude alinganayo.
UProfesa Koren waphawula: “Sisebenzise ama-monolide e-WS2 njengezinto zokuthola inzuzo ngoba le disulfide yensimbi yokuguquguquka kwe-band-gap eqondile ine-pseudo-spin eyingqayizivele yesigodi futhi ifundwe kabanzi njengendlela yokudlulisela ulwazi ehlukile kuma-electron esigodi. Ngokukhethekile, ama-exciton abo esigodini i-±K '(akhanya ngesimo se-planar spin-polarized dipole emitters) angavuselelwa ngokukhetha ukukhanya kwe-spin-polarized ngokusho kwemithetho yokukhetha ukuqhathanisa isigodi, ngaleyo ndlela alawule ngenkuthalo ukujikeleza okungenamaginethi.umthombo we-optical.
Ku-microcavity ye-spin valley ehlanganisiwe enesendlalelo esisodwa, ama-exciton e-±K 'valley ahlanganiswe nesimo se-±K spin valley ngokufanisa i-polarization, kanti i-spin exciton laser ekushiseni kwegumbi itholakala ngokukhanya okunamandla. Ngesikhathi esifanayo,i-laserIndlela yokusebenza iqhuba ama-exciton esigodini i-±K 'azimele esigabeni sokuqala ukuthola isimo sokulahlekelwa okuncane kwesistimu futhi imise kabusha ukuhlangana kokukhiya okusekelwe esigabeni sejiyometri esiphambene nesigodi se-±K spin.
Ukuhambisana kwesigodi okuqhutshwa yile ndlela ye-laser kuqeda isidingo sokunciphisa izinga lokushisa eliphansi lokusabalala okungenazikhawu. Ngaphezu kwalokho, isimo sokulahlekelwa okuncane kwe-laser ye-monolayer ye-Rashba singashintshwa yi-polarization yephampu eqondile (eyisiyingi), enikeza indlela yokulawula ukuqina kwe-laser kanye nokuhambisana kwendawo.
UProfesa Hasman uyachaza: “Okwembulwei-photonicI-spin valley Rashba effect inikeza indlela ejwayelekile yokwakha imithombo ye-spin optical ekhipha ubuso. Ukuhambisana kwesigodi okuboniswe ku-microcavity ye-spin valley ehlanganisiwe enesendlalelo esisodwa kusisondeza esinyathelweni esisodwa ekufinyeleleni ukuxinana kolwazi lwe-quantum phakathi kwe-±K 'valley excitons nge-qubits.
Sekuyisikhathi eside, ithimba lethu lithuthukisa i-spin optics, lisebenzisa i-photon spin njengethuluzi eliphumelelayo lokulawula ukuziphatha kwamagagasi kagesi. Ngo-2018, sithakazeliswe yi-valley pseudo-spin ezintweni ezinezilinganiso ezimbili, saqala iphrojekthi yesikhathi eside yokuhlola ukulawulwa okusebenzayo kwemithombo ye-atomic-scale spin optical lapho kungekho khona amasimu kazibuthe. Sisebenzisa imodeli ye-Berry phase defect engeyona yendawo ukuxazulula inkinga yokuthola isigaba sejiyomethri esihambisanayo esivela ku-exciton eyodwa yesigodi.
Kodwa-ke, ngenxa yokuntuleka kwendlela eqinile yokuvumelanisa phakathi kwama-exciton, ukufakwa okuyisisekelo okuhlangene kwama-exciton amaningi esigodini emthonjeni wokukhanya we-Rashuba onesendlalelo esisodwa okuye kwafezwa akukaxazululwa. Le nkinga isishukumisela ukuba sicabange ngemodeli ye-Rashuba yama-photon aphezulu e-Q. Ngemva kokusungula izindlela ezintsha zomzimba, sisebenzise i-laser ye-Rashuba single-sendlalelo esisodwa echazwe kuleli phepha.
Le mpumelelo ivula indlela yokufunda ngezimo ezihambisanayo zokuhlangana kwe-spin emikhakheni yakudala neye-quantum, futhi ivula indlela entsha yocwaningo oluyisisekelo kanye nokusetshenziswa kwamadivayisi e-spinttronic kanye ne-photonic optoelectronic.
Isikhathi sokuthunyelwe: Mashi-12-2024