Lub ntiaj teb tshiab ntawm cov khoom siv optoelectronic

Lub ntiaj teb tshiab ntawmcov khoom siv optoelectronic

Cov kws tshawb fawb ntawm Technion-Israel lub koom haum thev naus laus zis tau tsim kev sib koom ua ke tswj kev sib twkho qhov muag laserraws li ib txheej atomic. Qhov kev tshawb pom no tau ua tiav los ntawm kev sib koom ua ke ntawm kev sib koom ua ke ntawm ib txheej atomic thiab kab rov tav txwv photonic spin lattice, uas txhawb nqa high-Q spin valley los ntawm Rashaba-hom spin splitting ntawm photons ntawm bound xeev nyob rau hauv lub continuum.
Qhov tshwm sim, luam tawm nyob rau hauv Cov Khoom Siv Xwm Txheej thiab tseem ceeb hauv nws cov kev tshawb fawb luv luv, ua rau txoj hauv kev rau txoj kev tshawb fawb ntawm kev sib koom ua ke ntawm cov xwm txheej cuam tshuam hauv classical thiabquantum systems, thiab qhib txoj hauv kev tshiab rau kev tshawb fawb thiab kev siv hluav taws xob thiab photon spin hauv optoelectronic li. Lub spin optical qhov sib txuas ua ke ntawm photon hom nrog kev hloov hluav taws xob, uas muab ib txoj hauv kev rau kev kawm cov ntaub ntawv sib hloov ntawm cov electrons thiab photons thiab tsim cov khoom siv optoelectronic siab heev.

Spin valley optical microcavities yog tsim los ntawm interfacing photonic spin lattices nrog inversion asymmetry (yellow core cheeb tsam) thiab inversion symmetry (cyan cladding cheeb tsam).
Txhawm rau tsim cov peev txheej no, qhov yuav tsum tau ua ua ntej yog txhawm rau tshem tawm cov spin degeneracy ntawm ob lub xeev rov qab nyob rau hauv photon lossis electron ib feem. Qhov no feem ntau yog ua tiav los ntawm kev siv lub teb sib nqus raws li Faraday lossis Zeeman effect, txawm hais tias cov txheej txheem no feem ntau yuav tsum muaj cov hlau nplaum muaj zog thiab tsis tuaj yeem tsim microsource. Lwm qhov kev cog lus zoo yog ua raws li lub koob yees duab geometric uas siv cov khoom sib nqus sib nqus los tsim cov spin-split xeev ntawm photons hauv qhov chaw muaj zog.
Hmoov tsis zoo, kev soj ntsuam yav dhau los ntawm kev sib cais ntawm lub xeev tau tso siab ntau rau cov qauv kev nthuav tawm qis, uas ua rau muaj kev cuam tshuam tsis zoo rau ntawm qhov chaw thiab lub sijhawm ntawm qhov chaw. Txoj hauv kev no tseem cuam tshuam los ntawm kev tswj hwm qhov xwm txheej ntawm blocky laser-tau cov ntaub ntawv, uas tsis tuaj yeem lossis tsis tuaj yeem siv tau yooj yim los tswj.qhov chaw teeb, tshwj xeeb tshaj yog nyob rau hauv tsis muaj magnetic teb ntawm chav tsev kub.
Txhawm rau ua kom tiav high-Q spin-splitting xeev, cov kws tshawb fawb tau tsim cov photonic spin lattices nrog sib txawv symmetries, nrog rau cov tub ntxhais nrog inversion asymmetry thiab ib lub hnab ntawv inversion symmetric nrog rau WS2 ib txheej, los tsim laterally constrained spin valleys. Qhov yooj yim inverse asymmetric lattice siv los ntawm cov kws tshawb fawb muaj ob yam tseem ceeb.
Lub controllable spin-dependent reciprocal lattice vector tshwm sim los ntawm geometric theem qhov chaw variation ntawm heterogeneous anisotropic nanoporous muaj li ntawm lawv. Qhov vector no faib cov kiv degradation band rau hauv ob ceg spin-polarized hauv qhov chaw nrawm, hu ua photonic Rushberg effect.
Ib khub ntawm siab Q symmetric (quasi) bound xeev nyob rau hauv lub continuum, uas yog ± K (Brillouin band Angle) photon spin valleys ntawm ntug ntawm spin splitting ceg, tsim ib coherent superposition ntawm sib npaug amplitudes.
Xib fwb Koren tau sau tseg tias: "Peb siv WS2 monolides los ua cov khoom lag luam vim tias qhov kev hloov pauv ncaj qha ntawm cov hlau disulfide no muaj qhov tshwj xeeb pseudo-spin thiab tau kawm ntau yam los ntawm lwm cov ntaub ntawv nqa khoom hauv hav hluav taws xob. Tshwj xeeb, lawv ± K 'valley excitons (uas radiate nyob rau hauv daim ntawv ntawm planar spin-polarized dipole emitters) muaj peev xwm xaiv tau zoo siab los ntawm spin-polarized lub teeb raws li valley sib piv cov cai, yog li nquag tswj ib tug magnetically dawb spin.optical qhov chaw.
Nyob rau hauv ib txheej ib txheej integrated spin valley microcavity, lub ± K 'koob excitons yog ua ke rau lub ± K spin valley xeev los ntawm polarization txuam, thiab spin exciton laser ntawm chav tsev kub yog paub los ntawm lub teeb pom kev zoo. Nyob rau tib lub sijhawm, lublasermechanism tsav cov theem pib-yooj yim ± K 'koob excitons mus nrhiav qhov tsawg kawg nkaus poob lub xeev ntawm lub system thiab rov tsim lub xauv-nyob rau hauv correlation raws li lub geometric theem opposite lub ± K spin hav.
Valley coherence uas tau tsav los ntawm lub tshuab laser no tshem tawm qhov xav tau ntawm qhov kub thiab txias ntawm kev sib tshuam ntawm kev tawg. Tsis tas li ntawd, qhov tsawg kawg poob lub xeev ntawm Rashba monolayer laser tuaj yeem hloov kho los ntawm linear (circular) twj polarization, uas muab txoj hauv kev los tswj kev siv laser thiab spatial coherence. "
Xibhwb Hasman piav qhia tias: “Tus uas qhia tawmphotonicspin valley Rashba effect muab cov txheej txheem dav dav rau kev tsim kho qhov chaw-emitting spin optical qhov chaw. Lub hav coherence pom nyob rau hauv ib txheej ib-txheej integrated spin valley microcavity coj peb ib kauj ruam los ze zog mus ua kom tiav quantum ntaub ntawv entanglement ntawm ±K 'koob excitons ntawm qubits.
Tau ntev, peb pab neeg tau tsim spin optics, siv photon spin yog ib qho cuab yeej zoo rau kev tswj tus cwj pwm ntawm electromagnetic yoj. Nyob rau hauv 2018, intrigued los ntawm lub hav pseudo-spin nyob rau hauv ob-dimensional ntaub ntawv, peb pib ib tug ntev lub sij hawm project los soj ntsuam cov nquag tswj ntawm atomic-scale spin optical qhov chaw nyob rau hauv tsis muaj magnetic teb. Peb siv cov qauv uas tsis yog hauv zos Berry theem teeb meem los daws qhov teeb meem ntawm kev tau txais cov theem geometric coherent los ntawm ib lub hav exciton.
Txawm li cas los xij, vim tias tsis muaj lub zog synchronization mechanism ntawm excitons, lub hauv paus coherent superposition ntawm ntau lub hav excitons nyob rau hauv Rashuba ib-txheej teeb qhov chaw uas tau ua tiav tseem unsolved. Qhov teeb meem no txhawb peb xav txog Rashuba qauv ntawm siab Q photons. Tom qab kev tsim kho lub cev tshiab, peb tau siv Rashuba ib txheej laser piav qhia hauv daim ntawv no. "
Qhov kev ua tiav no ua rau txoj hauv kev rau txoj kev kawm ntawm kev sib koom ua ke ntawm kev sib raug zoo tshwm sim nyob rau hauv classical thiab quantum teb, thiab qhib ib txoj hauv kev tshiab rau kev tshawb fawb yooj yim thiab siv cov khoom siv spintronic thiab photonic optoelectronic.