Umhlaba omusha weamadivaysi e-optoelectronic
Abacwaningi e-Technion-Israel Institute of Technology benze i-spin elawulwa ngokuhambisanayolaser opticalngokusekelwe kungqimba olulodwa lwe-athomu.Lokhu kutholwa kwenziwe kwaba khona ukuxhumana okuhambisanayo okuncike ku-spin phakathi kwesendlalelo se-athomu esisodwa kanye ne-photonic spin lattice eboshelwe ngokuvundlile, esekela isigodi esiyi-Q spin ngokuhlukana kohlobo lwe-Rashaba lwama-photons wezifunda ezibophekile ukuqhubeka.
Umphumela, oshicilelwe ku-Nature Materials futhi wagqanyiswa emfushane lwayo yocwaningo, uvula indlela yocwaningo lwezenzakalo ezihlobene ne-spin ezihambisanayo ku-classical andamasistimu we-quantum, futhi ivula izindlela ezintsha zocwaningo oluyisisekelo kanye nokusetshenziswa kwe-electron ne-photon spin emishinini ye-optoelectronic.Umthombo we-spin optical uhlanganisa imodi ye-photon ne-electron transition, ehlinzeka ngendlela yokufunda ukushintshana kolwazi lwe-spin phakathi kwama-electron nama-photons kanye nokuthuthukisa amadivaysi e-optoelectronic athuthukile.
Ama-microcavities optical we-spin valley akhiwa ngokuxhumanisa ama-photonic spin lattices ane-inversion asymmetry (yellow core region) kanye ne-inversion symmetry (isifunda se-cyan cladding).
Ukuze wakhe le mithombo, imfuneko iwukuqeda ukuwohloka kwe-spin phakathi kwezifunda ezimbili eziphambene engxenyeni ye-photon noma ye-electron.Lokhu ngokuvamile kufezwa ngokusebenzisa inkambu kazibuthe ngaphansi komphumela we-Faraday noma we-Zeeman, nakuba lezi zindlela ngokuvamile zidinga insimu enamandla kazibuthe futhi azikwazi ukukhiqiza umthombo omncane.Enye indlela ethembisayo isekelwe ohlelweni lwekhamera yejiyomethri esebenzisa inkambu yakazibuthe yokwenziwa ukuze ikhiqize izimo ezihlukanisayo zama-photons esikhaleni somfutho.
Ngeshwa, ukubhekwa kwangaphambilini kwezifunda ezihlukene ze-spin kuncike kakhulu ezindleleni zokusabalalisa izinto ezinobuningi obuphansi, okubeka imingcele emibi ekuhlanganeni kwendawo kanye neyesikhashana kwemithombo.Le ndlela futhi iphazanyiswa uhlobo olulawulwa yi-spin lwe-blocky laser-gain materials, engakwazi noma engakwazi ukusetshenziswa kalula ukulawula ngokuqhubekayo.imithombo yokukhanya, ikakhulukazi lapho kungabikho amandla kazibuthe ekamelweni lokushisa.
Ukuze kuzuzwe izifunda ze-high-Q spin-splitting, abacwaningi bakhe ama-photonic spin lattices anama-symmetry ahlukene, okuhlanganisa umongo one-asymmetry eguquliwe kanye nemvilophu ye-symmetric inversion ehlanganiswe nesendlalelo esisodwa se-WS2, ukuze kukhiqizwe izigodi eziphonswe eceleni.I-lattice eyisisekelo ephambene ne-asymmetric esetshenziswa abacwaningi inezakhiwo ezimbili ezibalulekile.
I-spin-dendected reciprocal lattice vector elawulekayo encike kwi-spin ebangelwa ukuhluka kwesikhala sesigaba sejiyomethri se-heterogeneous anisotropic nanoporous eyakhiwe ngazo.Le vector ihlukanisa ibhande lokuwohloka kwe-spin libe amagatsha amabili a-spin-polarized esikhaleni somfutho, aziwa ngokuthi umphumela we-photonic Rushberg.
Ipheya yezifunda eziboshiwe ezilinganayo ze-Q eziphezulu (quasi) ku-continuum, okuyizigodi ze-photon spin ze-±K(Brillouin band Angle) emaphethelweni amagatsha ahlukanisayo ahlukanisayo, zakha ukuphakama okuphezulu okuhambisanayo kwama-amplitude alinganayo.
USolwazi Koren waphawula: “Sisebenzise ama-monolides e-WS2 njengezinto zokuzuza ngenxa yokuthi le-disulfide ye-band-gap transition metal ehlukile ine-valley pseudo-spin eyingqayizivele futhi iye yacutshungulwa kabanzi njengenye into ethwala ulwazi kuma-electron esigodini.Ngokukhethekile, ama-±K 'valley excitons (akhazimula ngendlela yama-planar spin-polarized dipole emitters) angajatshuliswa ngokukhetha ukukhanya kwe-spin-polarized ngokuvumelana nemithetho yokuqhathanisa yesigodi, ngaleyo ndlela alawule ngenkuthalo i-spin engenamagnetic.umthombo optical.
Kusendlalelo esisodwa esihlanganisiwe se-spin valley microcavity, i-±K 'valley excitons ihlanganiswe ne-±K spin Valley state ngokufanisa i-polarization, kanye ne-spin exciton laser kuzinga lokushisa kwekamelo ibonwa ngempendulo yokukhanya okunamandla.Ngesikhathi esifanayo, i-laserindlela ishayela i-±K 'valley excitons ekuqaleni ezizimele ukuze kutholwe ubuncane besimo sokulahlekelwa kwesistimu futhi kumiswe kabusha ukuhlobana kokukhiya okusekelwe esigabeni sejiyomethri esibhekene ne-±K spin valley.
Ukuhlangana kwesigodi okuqhutshwa yilo mshini we-laser kuqeda isidingo sokucindezelwa kwezinga lokushisa eliphansi lokuhlakazeka ngezikhathi ezithile.Ngaphezu kwalokho, isimo esincane sokulahlekelwa kwe-laser ye-Rashba monolayer singashintshwa nge-polarization yephampu eqondile (eyisiyingi), enikeza indlela yokulawula ukuqina kwe-laser nokuhambisana kwendawo."
UProfesa Hasman uyachaza: “Okwambuliweyoisithombei-spin valley Rashba effect inikeza indlela evamile yokwakha imithombo ye-spin optical ephuma phezulu.Ukuhlangana kwesigodi okuboniswa ku-spin valley microcavity enesendlalelo esisodwa kusisondeza isinyathelo esisodwa ekuzuzeni ulwazi oluningi phakathi kwe-±K 'valley excitons nge-qubits.
Isikhathi eside, ithimba lethu belithuthukisa i-spin optics, lisebenzisa i-photon spin njengethuluzi elisebenzayo lokulawula ukuziphatha kwamagagasi kagesi.Ngo-2018, sithakaswe i-valley pseudo-spin ezintweni ezinezinhlangothi ezimbili, saqala iphrojekthi yesikhathi eside yokuphenya ukulawulwa okusebenzayo kwemithombo ye-atomic-scale spin optical ngaphandle kwezinkundla kazibuthe.Sisebenzisa imodeli yesigaba se-Berry engeyona eyendawo ukuze sixazulule inkinga yokuthola isigaba sejiyomethri esihambisanayo kusuka ku-exciton yesigodi esisodwa.
Kodwa-ke, ngenxa yokuntuleka kwendlela yokuvumelanisa eqinile phakathi kwama-excitons, i-superposition eyisisekelo ehambisanayo yama-multiple valley excitons kumthombo wokukhanya wesendlalelo esisodwa se-Rashuba okuzuziwe kusalokhu kungaxazululiwe.Le nkinga isikhuthaza ukuthi sicabange ngemodeli ye-Rashuba yama-photon aphezulu we-Q.Ngemva kokusungula izindlela ezintsha ezingokwenyama, sisebenzise i-laser ye-Rashuba single-layer echazwe kuleli phepha.”
Le mpumelelo ivula indlela yocwaningo lwezenzakalo ezihambisanayo zokuhlobana kwe-spin emkhakheni we-classical kanye ne-quantum, futhi ivula indlela entsha yocwaningo oluyisisekelo nokusetshenziswa kwamadivayisi we-spintronic kanye ne-photonic optoelectronic.
Isikhathi sokuthumela: Mar-12-2024