Lub ntiaj teb tshiab ntawm cov khoom siv optoelectronic

Ib lub ntiaj teb tshiab ntawmcov khoom siv hluav taws xob optoelectronic

Cov kws tshawb fawb ntawm Technion-Israel Institute of Technology tau tsim ib qho kev sib hloov uas tswj tau zoo.laser kho qhov muagraws li ib txheej atomic. Qhov kev tshawb pom no tau ua tiav los ntawm kev sib cuam tshuam sib txuas ntawm ib txheej atomic thiab ib lub photonic spin lattice uas txwv tsis pub dhau, uas txhawb nqa lub hav dej siab-Q spin los ntawm Rashaba-hom spin splitting ntawm photons ntawm cov xeev khi hauv qhov txuas ntxiv.
Cov txiaj ntsig, luam tawm hauv Nature Materials thiab tau hais txog hauv nws cov ntawv tshawb fawb luv luv, tau qhib txoj hauv kev rau kev kawm txog cov xwm txheej sib raug zoo hauv cov qauv qub thiabcov txheej txheem quantum, thiab qhib txoj hauv kev tshiab rau kev tshawb fawb tseem ceeb thiab kev siv ntawm electron thiab photon spin hauv cov khoom siv optoelectronic. Lub spin optical source ua ke cov photon hom nrog rau kev hloov pauv electron, uas muab ib txoj hauv kev rau kev kawm txog kev sib pauv cov ntaub ntawv spin ntawm electrons thiab photons thiab tsim cov khoom siv optoelectronic siab heev.

Spin valley optical microcavities yog tsim los ntawm kev sib txuas photonic spin lattices nrog inversion asymmetry (daj core cheeb tsam) thiab inversion symmetry (cyan cladding cheeb tsam).
Yuav kom tsim tau cov peev txheej no, qhov yuav tsum tau ua ua ntej yog tshem tawm qhov kev puas tsuaj ntawm ob lub xeev sib txawv hauv qhov photon lossis electron. Qhov no feem ntau ua tiav los ntawm kev siv lub zog sib nqus hauv qab Faraday lossis Zeeman nyhuv, txawm hais tias cov txheej txheem no feem ntau xav tau lub zog sib nqus muaj zog thiab tsis tuaj yeem tsim cov microsource. Lwm txoj hauv kev zoo siab yog raws li lub koob yees duab geometric uas siv lub zog sib nqus dag los tsim cov xeev sib cais ntawm photons hauv qhov chaw momentum.
Hmoov tsis zoo, cov kev soj ntsuam yav dhau los ntawm kev sib cais ntawm lub xeev tau vam khom rau cov hom kev sib kis ntawm cov khoom qis, uas ua rau muaj kev txwv tsis zoo rau qhov chaw thiab lub sijhawm ntawm cov peev txheej. Txoj hauv kev no kuj raug cuam tshuam los ntawm qhov xwm txheej tswj hwm ntawm cov khoom siv blocky laser-gain, uas tsis tuaj yeem lossis tsis tuaj yeem siv tau yooj yim los tswj hwmcov chaw teeb pom kev zoo, tshwj xeeb tshaj yog thaum tsis muaj cov teb sib nqus ntawm chav tsev kub.
Yuav kom ua tiav cov xeev sib cais spin-splitting siab-Q, cov kws tshawb fawb tau tsim cov photonic spin lattices nrog cov symmetries sib txawv, suav nrog lub hauv paus nrog inversion asymmetry thiab ib lub inversion symmetric envelope uas koom ua ke nrog WS2 ib txheej, los tsim cov pas dej spin valleys. Lub lattice inverse asymmetric yooj yim uas cov kws tshawb fawb siv muaj ob yam khoom tseem ceeb.
Tus vector lattice uas tswj tau los ntawm kev sib hloov ntawm qhov chaw geometric ntawm cov heterogeneous anisotropic nanoporous uas muaj lawv. Tus vector no faib cov spin degradation band ua ob ceg spin-polarized hauv qhov chaw momentum, hu ua photonic Rushberg effect.
Ib khub ntawm cov xeev siab Q symmetric (quasi) khi hauv qhov txuas ntxiv, uas yog ±K (Brillouin band Angle) photon spin valleys ntawm ntug ntawm cov ceg sib cais spin, tsim ib qho coherent superposition ntawm cov amplitudes sib npaug.
Xibfwb Koren tau hais tias: "Peb siv cov WS2 monolides ua cov khoom siv nce vim tias qhov kev hloov pauv hlau disulfide no muaj qhov tshwj xeeb ntawm hav pseudo-spin thiab tau kawm ntau yam ua lwm txoj hauv kev xa cov ntaub ntawv hauv hav electrons. Tshwj xeeb, lawv cov ±K 'valley excitons (uas tawm hauv daim ntawv ntawm planar spin-polarized dipole emitters) tuaj yeem raug xaiv los ntawm lub teeb spin-polarized raws li cov cai xaiv sib piv hav, yog li tswj hwm lub zog magnetically free spin.qhov chaw kho qhov muag.
Hauv ib txheej txheej sib xyaw ua ke ntawm lub voj voog me me, cov excitons ± K 'valley tau txuas nrog lub xeev ± K spin valley los ntawm kev sib phim polarization, thiab lub laser spin exciton ntawm chav tsev kub tau pom los ntawm kev tawm tswv yim lub teeb muaj zog. Tib lub sijhawm,laserLub tshuab tsav cov excitons uas tsis yog theem pib ntawm ± K 'valley kom nrhiav tau qhov poob qis tshaj plaws ntawm lub kaw lus thiab rov tsim kom muaj kev sib raug zoo raws li theem geometric uas nyob ib sab ntawm ± K spin valley.
Kev sib koom ua ke ntawm hav uas tsav los ntawm lub tshuab laser no tshem tawm qhov xav tau kev tswj hwm qhov kub qis ntawm kev tawg ua ntu zus. Tsis tas li ntawd, qhov poob qis tshaj plaws ntawm Rashba monolayer laser tuaj yeem hloov kho los ntawm kev sib xyaw ua ke ntawm lub twj tso kua mis linear (circular), uas muab txoj hauv kev los tswj qhov muaj zog ntawm laser thiab kev sib koom ua ke ntawm qhov chaw.
Xibfwb Hasman piav qhia tias: "Qhov kev tshwm simphotonicspin valley Rashba effect muab ib txoj hauv kev dav dav rau kev tsim cov chaw teeb pom kev zoo ntawm qhov chaw. Qhov kev sib koom ua ke ntawm hav uas tau pom hauv ib txheej kev sib xyaw ua ke ntawm spin valley microcavity coj peb mus ze rau kev ua tiav cov ntaub ntawv quantum ntawm ±K 'valley excitons ntawm qubits.
Tau ntev heev lawm, peb pab neeg tau tsim cov kev siv tshuab spin optics, siv photon spin ua ib qho cuab yeej zoo rau kev tswj tus cwj pwm ntawm cov nthwv dej electromagnetic. Xyoo 2018, xav paub txog lub hav pseudo-spin hauv cov khoom siv ob-seem, peb tau pib ua haujlwm ntev los tshawb nrhiav kev tswj hwm ntawm cov chaw atomic-scale spin optical hauv qhov tsis muaj cov teb magnetic. Peb siv cov qauv Berry theem tsis yog hauv zos los daws qhov teeb meem ntawm kev tau txais cov theem geometric sib xws los ntawm ib qho exciton ntawm hav.
Txawm li cas los xij, vim tsis muaj lub tshuab sib dhos ua ke zoo ntawm cov excitons, qhov sib txuas ua ke tseem ceeb ntawm ntau lub hav excitons hauv Rashuba ib txheej teeb pom kev zoo uas tau ua tiav tseem tsis tau daws. Qhov teeb meem no txhawb peb kom xav txog Rashuba tus qauv ntawm cov photons Q siab. Tom qab tsim kho tshiab cov txheej txheem lub cev, peb tau siv Rashuba ib txheej laser piav qhia hauv daim ntawv no.
Qhov kev ua tiav no tau qhib txoj hauv kev rau kev kawm txog cov xwm txheej sib raug zoo ntawm kev sib raug zoo hauv cov teb classical thiab quantum, thiab qhib txoj hauv kev tshiab rau kev tshawb fawb yooj yim thiab kev siv cov khoom siv optoelectronic spintronic thiab photonic.