Nyika itsva yezvishandiso zvemagetsi zve optoelectronic
Vaongorori vepaTechnion-Israel Institute of Technology vakagadzira nzira inodzorwa zvakanakalaser yemazisozvichibva pachikamu chimwe chete cheatomu. Kuwanikwa uku kwakaitwa kuti kuvepo nekuda kwekudyidzana kwakabatana pakati pechikamu chimwe chete cheatomu nechikamu che photonic spin chakabatanidzwa chakatarwa, icho chinotsigira mupata we high-Q spin kuburikidza nekupatsanurwa kwemhando yeRashaba-type spin kwema photon e bound states mu continuum.
Mhedzisiro yacho, yakaburitswa muNature Materials uye yakatsanangurwa muchidimbu chayo chekutsvagisa, inovhura nzira yekudzidza zviitiko zvine chekuita nekutenderera kwakabatana muzvinyorwa zvekare uyemasisitimu equantum, uye inovhura nzira itsva dzekutsvaga kwekutanga uye mashandisirwo eelectron nephoton spin muzvishandiso zve optoelectronic. Sosi ye spin optical inosanganisa photon mode ne electron transition, iyo inopa nzira yekudzidza kuchinjana kwemashoko e spin pakati pema electron nema photon uye kugadzira zvishandiso zve optoelectronic zvepamusoro.
Ma "Spin valley optical microcavities" anogadzirwa nekubatanidza ma "photonic spin lattices" ane "inversion asymmetry" (yellow core region) uye "inversion symmetry" (cyan cladding region).
Kuti pave nekuvaka manyuko aya, chinodiwa ndechekubvisa kushata kwe spin pakati pema state maviri akasiyana ekutenderera muchikamu che photon kana electron. Izvi zvinowanzoitwa nekushandisa simba remagineti pasi peFaraday kana Zeeman effect, kunyange zvazvo nzira idzi dzinowanzoda simba remagineti rakasimba uye dzisingakwanise kugadzira microsource. Imwe nzira inovimbisa yakavakirwa pane system yekamera inoshandisa simba remagineti rekugadzira kugadzira ma states e spin-split e photons munzvimbo ye momentum.
Zvinosuwisa kuti zvakamboonekwa kare nezvemamiriro ekupatsanurwa kwespin zvakavimba zvakanyanya nenzira dzekupararira kwezvinhu zvishoma, izvo zvinoisa zvipingamupinyi zvakashata pakuwirirana kwenzvimbo nenguva kwezvinobva. Nzira iyi inokanganiswawo nehunhu hwezvinhu zvinodzora kutenderera kwelaser-gain, izvo zvisingakwanise kana kuti zvisingagone kushandiswa zviri nyore kudzora.manyuko echiedza, kunyanya kana pasina simba remagineti patembiricha yemumba.
Kuti vasvike pakupatsanurana kweQ-spin, vaongorori vakagadzira ma photonic spin lattices ane symmetries dzakasiyana, kusanganisira core ine inversion asymmetry uye inversion symmetric envelope yakabatanidzwa neWS2 single layer, kugadzira laterally constrained spin valleys. Iyo basic inverse asymmetric lattice inoshandiswa nevaongorori ine zvinhu zviviri zvakakosha.
Vector inodzoreka inotenderera inotenderera inokonzerwa nekusiyana kwenzvimbo ye geometric phase ye heterogeneous anisotropic nanoporous yakagadzirwa navo. Vector iyi inopatsanura band re spin degradation kuita matavi maviri anotenderera ari munzvimbo ye momentum, inozivikanwa se photonic Rushberg effect.
Maviri eQ symmetric (quasi) bound states ari mu continuum, kureva ±K(Brillouin band Angle) photon spin valleys pamucheto we spin splitting branchs, anoumba coherent superposition ye equal amplitudes.
Purofesa Koren akati: “Takashandisa mamonolide eWS2 sezvinhu zvinoita kuti pave nekuwedzera simba nekuti iyi direct band-gap transition metal disulfide ine mupata wepseudo-spin wakasiyana uye yakaongororwa zvakanyanya seimwe nzira yekutakura ruzivo mumaerekitironi emupata. Kunyanya, maexciton avo e±K 'valley (anopenya muchimiro cheplanar spin-polarized dipole emitters) anogona kunakidzwa nechiedza chespin-polarized zvichienderana nemitemo yekuenzanisa mupata, nokudaro achidzora kutenderera kwemagnetically free.manyuko emaziso.
Muchikamu chimwe chete che "spin valley microcavity", "±K 'valley excitons" dzakabatana ne "±K spin valley state" ne "polarization matching", uye "spin exciton laser" patembiricha yemukamuri inowanikwa ne "light feedback" yakasimba. Panguva imwe chete, "lasernzira iyi inotyaira ma "excitons" ekutanga asina kusimba e "phase-independent phase" kuti awane mamiriro ekurasikirwa kushoma kwesystem uye kugadzirisa zvakare hukama hwekukiya-mukati zvichibva pa "geometric phase" yakatarisana ne "±K spin valley".
Kubatana kwemupata kunokonzerwa neiyi nzira yelaser kunobvisa kudiwa kwekudzora kupisa kwakaderera kwekupararira kwepakati nepakati. Pamusoro pezvo, mamiriro ekurasikirwa kudiki kweRashba monolayer laser anogona kugadziriswa ne pombi yakatsetseka (yakatenderera), iyo inopa nzira yekudzora simba relaser uye kubatana kwenzvimbo.
Purofesa Hasman anotsanangura kuti: “ZvakaratidzwamufananidzoMupata we spin Rashba mhedzisiro inopa nzira yakajairika yekugadzira masosi e spin optical anoburitsa pamusoro. Kubatana kwemupata kunoratidzwa muchikamu chimwe chete chakabatanidzwa che spin valley microcavity kunotiswededza padanho rimwe chete rekuwana kupindirana kweruzivo rwe quantum pakati pe ±K 'valley excitons kuburikidza ne qubits.
Kwenguva yakareba, timu yedu yave ichigadzira spin optics, ichishandisa photon spin sechishandiso chinoshanda chekudzora maitiro emafungu emagetsi. Muna 2018, tichifadzwa ne valley pseudo-spin muzvinhu zvine mativi maviri, takatanga chirongwa chenguva refu chekuongorora kudzora kwakasimba kweatomic-scale spin optical sources pasina magnetic fields. Tinoshandisa non-local Berry phase defect model kugadzirisa dambudziko rekuwana coherent geometric phase kubva kune single valley exciton.
Zvisinei, nekuda kwekushaikwa kwesimba rekubatanidza pakati pema "excitons", kuumbwa kwakakosha kwe "multiple valley excitons" muRashuba single-layer light source" kwakaitwa kuchiri kusagadziriswa. Dambudziko iri rinotikurudzira kufunga nezveRashuba model ye high Q photons. Mushure mekugadzira nzira itsva dzepanyama, takashandisa Rashuba single-layer laser inotsanangurwa mupepa rino.
Kubudirira uku kunovhura nzira yekudzidza nezve coherent spin correlation phenomena muminda yekare neye quantum, uye kunovhura nzira itsva yekutsvagisa kwekutanga nekushandiswa kwezvishandiso zve spintronic ne photonic optoelectronic.
Nguva yekutumira: Kurume-12-2024