Ihlabathi elitsha leizixhobo ze-optoelectronic
Abaphandi kwiTechnion-Israel Institute of Technology baphuhlise ukujikeleza okulawulwa ngokudibeneyoi-laser yokukhanyaisekelwe kumaleko omnye weathomu. Oku kufunyaniswa kwenzeke ngenxa yokusebenzisana okuhlangeneyo okuxhomekeke kwi-spin phakathi komaleko omnye weathomu kunye ne-photonic spin lattice enqamlezileyo, exhasa i-high-Q spin valley ngokusebenzisa i-Rashaba-type spin split of photons of bound states in the continuum.
Isiphumo, esipapashwe kwiNature Materials saza sagqanyiswa kwisishwankathelo sophando lwaso, sivula indlela yokufunda ngezinto ezinxulumene nokujikeleza ezihambelanayo kwiklasikhi nakwi-iinkqubo ze-quantum, kwaye ivula iindlela ezintsha zophando olusisiseko kunye nokusetyenziswa kwe-electron kunye ne-photon spin kwizixhobo ze-optoelectronic. Umthombo we-spin optical udibanisa imo ye-photon kunye notshintsho lwe-electron, olubonelela ngendlela yokufunda utshintshiselwano lolwazi lwe-spin phakathi kwe-electron kunye ne-photons kunye nokuphuhlisa izixhobo ze-optoelectronic eziphambili.
Ii-microcavities ze-Spin valley optical zakhiwe ngokudityaniswa kwe-photonic spin lattices kunye ne-inversion asymmetry (ummandla otyheli we-core) kunye ne-inversion symmetry (ummandla we-cyan cladding).
Ukuze kwakhiwe le mithombo, imfuneko kukuphelisa ukonakala kwe-spin phakathi kweemeko ezimbini ezichaseneyo ze-spin kwinxalenye ye-photon okanye ye-electron. Oku kudla ngokufezekiswa ngokusebenzisa i-magnetic field phantsi kwe-Faraday okanye i-Zeeman effect, nangona ezi ndlela zihlala zifuna i-magnetic field enamandla kwaye azinakuvelisa umthombo omncinci. Enye indlela ethembisayo isekelwe kwinkqubo yekhamera yejometri esebenzisa i-magnetic field yokwenziwa ukuvelisa iimeko ze-spin-split ze-photons kwindawo ye-momentum.
Ngelishwa, ukubonwa kwangaphambili kweemeko zokwahlulwahlulwa kwe-spin kuxhomekeke kakhulu kwiindlela zokusasazeka kwezinto ezinobunzima obuphantsi, ezibeka imida emibi ekuhambelaneni kwendawo kunye nexesha lemithombo. Le ndlela ikwathintelwa yindlela elawulwa yi-spin yezinto ezithintela i-laser-gain, ezingenakusetyenziselwa okanye ezingenakusetyenziswa lula ukulawula ngokukhutheleyo.imithombo yokukhanya, ingakumbi xa kungekho magnetic fields kubushushu begumbi.
Ukuze kufezekiswe iimeko zokwahlukana kwe-high-Q spin, abaphandi bakhe ii-photonic spin lattices ezine-symmetries ezahlukeneyo, kubandakanya i-core ene-inversion asymmetry kunye ne-inversion symmetric envelope edityaniswe nomaleko omnye we-WS2, ukuvelisa ii-spin valleys ezixineneyo ecaleni. I-inversion asymmetric lattice esisiseko esetyenziswa ngabaphandi ineempawu ezimbini ezibalulekileyo.
Ivektha yelatisi elawulwayo exhomekeke kwi-spin elawulwayo ebangelwa kukuguquguquka kwesithuba sejiyometri ye-heterogeneous anisotropic nanoporous eyenziwe ngazo. Le vektha yahlula i-spin degradation band ibe ngamasebe amabini e-spin-polarized kwi-momentum space, eyaziwa ngokuba yi-photonic Rushberg effect.
Izibini zeemeko ezibotshelelweyo ze-Q ezilinganayo (quasi) kwi-continuum, ezizezi: ii-±K(Brillouin band Angle) photon spin valleys kumda wamasebe aqhekekayo e-spin, zenza i-contemporary superposition ye-amplitudes elinganayo.
UNjingalwazi Koren waphawula: “Sisebenzise ii-monolides ze-WS2 njengezinto zokufumana inzuzo kuba le dayisulfide ye-transition metal disulfide ethe ngqo ine-pseudo-spin eyahlukileyo ye-valley kwaye ifundwe ngokubanzi njengesixhobo sokuhambisa ulwazi oluhlukileyo kwii-electron ze-valley. Ngokukodwa, ii-excitons zazo ze-±K 'valley (ezikhanya ngohlobo lwe-planar spin-polarized dipole emitters) zinokuvuselelwa ngokukhetha kukukhanya kwe-spin-polarized ngokwemigaqo yokukhetha i-valley comparison, ngaloo ndlela zilawula ngokukhutheleyo i-magnetically free spin.umthombo we-optical.
Kwi-microcavity ye-spin valley edibeneyo yomaleko omnye, ii-excitons ze-±K 'valley zidityaniswe ne-±K spin valley state ngokufanisa i-polarization, kwaye i-spin exciton laser kubushushu begumbi ibonwa ngokuphendula okunamandla kokukhanya. Kwangaxeshanye, iilezaIndlela yokusebenza iqhuba ii-excitons ze-±K 'valley ezizimeleyo kwisigaba sokuqala ukuze zifumane imeko yokulahleka okuncinci kwenkqubo kwaye ziphinde ziseke ulwalamano lokutshixa olusekwe kwisigaba sejiyometri esichasene ne-±K spin valley.
Ukuhambelana kweValley okuqhutywa yile ndlela yelaser kususa imfuneko yokunciphisa ubushushu obuphantsi bokusasaza okungenaziphazamiso. Ukongeza, imeko yokulahleka okuncinci kwelaser yeRashba monolayer inokuguqulwa yi-linear (circular) pump polarization, ebonelela ngendlela yokulawula ubunzulu belaser kunye nokuhambelana kwendawo.
UNjingalwazi uHasman ucacisa athi: “Okutyhiliweyoi-photonicI-spin valley Isiphumo seRashba sibonelela ngendlela eqhelekileyo yokwakha imithombo ye-spin optical ekhupha umphezulu. Ukuhambelana kwe-valley okuboniswe kwi-microcavity ye-spin valley edibeneyo yomaleko omnye kusisondeza kwinyathelo elinye ekufezekiseni ukuxinana kolwazi lwe-quantum phakathi kwe-±K 'valley excitons nge-qubits.
Kangangexesha elide, iqela lethu beliphuhlisa i-spin optics, lisebenzisa i-photon spin njengesixhobo esisebenzayo sokulawula indlela amaza e-electromagnetic aziphatha ngayo. Ngo-2018, sinomdla kwi-valley pseudo-spin kwizixhobo ezinemilinganiselo emibini, saqala iprojekthi yexesha elide yokuphanda ulawulo olusebenzayo lwemithombo ye-atomic-scale spin optical xa kungekho magnetic fields. Sisebenzisa imodeli ye-Berry phase defect engekhoyo ukusombulula ingxaki yokufumana i-coherent geometric phase kwi-single valley exciton.
Nangona kunjalo, ngenxa yokungabikho kwendlela eqinileyo yokuvumelanisa phakathi kwee-excitons, i-superposition esisiseko ye-excitons ezininzi ze-valley kumthombo wokukhanya we-Rashuba one-layer single-layer efezekisiweyo ayikasonjululwa. Le ngxaki isikhuthaza ukuba sicinge ngemodeli yeRashuba yee-photons ze-Q eziphezulu. Emva kokuvelisa iindlela ezintsha zomzimba, sisebenzise i-laser ye-Rashuba single-layer echazwe kweli phepha.
Le mpumelelo ivula indlela yokufunda ngeziganeko zokudibanisa ukujikeleza okuhlangeneyo kwiindawo zakudala neze-quantum, kwaye ivula indlela entsha yophando olusisiseko kunye nokusetyenziswa kwezixhobo ze-spinttronic kunye ne-photonic optoelectronic.
Ixesha leposi: Matshi-12-2024