Dziko latsopano la zipangizo zamagetsi

Dziko latsopano lazipangizo zamagetsi za optoelectronic

Ofufuza ku Technion-Israel Institute of Technology apanga njira yozungulira yolamulidwa bwinolaser yowalakutengera gawo limodzi la atomu. Kupezeka kumeneku kunatheka chifukwa cha kugwirizana kogwirizana pakati pa gawo limodzi la atomu ndi lattice yozungulira ya photonic spin, yomwe imathandizira chigwa cha high-Q spin kudzera mu kugawanika kwa ma photon a bound states mu continuum.
Zotsatira zake, zomwe zinasindikizidwa mu Nature Materials ndipo zafotokozedwa mu kafukufuku wake, zikutsegula njira yophunzirira zochitika zokhudzana ndi kuzungulira kogwirizana m'ma classical ndimachitidwe a quantum, ndipo imatsegula njira zatsopano zofufuzira zoyambira ndi kugwiritsa ntchito ma electron ndi photon spin muzipangizo zamagetsi. Gwero la kuwala kwa spin limaphatikiza mawonekedwe a photon ndi kusintha kwa ma electron, komwe kumapereka njira yophunzirira kusinthana kwa chidziwitso cha spin pakati pa ma electron ndi ma photon ndikupanga zida zamakono zamagetsi zamagetsi.

Ma microcavities a Spin valley optical amapangidwa ndi ma photonic spin lattices olumikizana ndi inversion asymmetry (yellow core region) ndi inversion symmetry (cyan cladding region).
Pofuna kupanga magwero awa, chofunikira ndi kuthetsa kusokonekera kwa spin pakati pa ma spin awiri osiyana mu gawo la photon kapena electron. Izi nthawi zambiri zimachitika pogwiritsa ntchito mphamvu ya maginito pansi pa Faraday kapena Zeeman effect, ngakhale kuti njira izi nthawi zambiri zimafuna mphamvu ya maginito yamphamvu ndipo sizingapange microsource. Njira ina yodalirika ndiyo kugwiritsa ntchito makina a kamera omwe amagwiritsa ntchito mphamvu ya maginito yopangira kupanga ma photon omwe amagawanika m'malo a momentum.
Mwatsoka, zomwe zidawonedwa kale za ma spin split states zakhala zikugwiritsa ntchito kwambiri njira zofalitsira zinthu zochepa, zomwe zimapangitsa kuti pakhale zoletsa pakugwirizana kwa malo ndi nthawi ya magwero. Njira imeneyi imalepheretsedwanso ndi momwe zinthu zotchinga laser-gain zimalamulira spin, zomwe sizingagwiritsidwe ntchito mosavuta polamulira mwachangu.magwero a kuwala, makamaka ngati palibe mphamvu zamaginito pa kutentha kwa chipinda.
Kuti akwaniritse momwe Q spin-splitting imagwiritsidwira ntchito, ofufuzawa adapanga ma photonic spin lattices okhala ndi ma symmetry osiyanasiyana, kuphatikiza core yokhala ndi inversion asymmetry ndi inversion symmetric envelope yolumikizidwa ndi WS2 single layer, kuti apange ma spin valleys ozungulira. Ma inverse asymmetric lattice oyambira omwe ofufuzawa amagwiritsa ntchito ali ndi zinthu ziwiri zofunika.
Vekitala yozungulira yozungulira yomwe imadalira spin yomwe imayendetsedwa ndi kusintha kwa malo a geometric phase space kwa heterogeneous anisotropic nanoporous yomwe imapangidwa ndi iwo. Vekitala iyi imagawa gulu la spin degradation m'magawo awiri a spin-polarized mu momentum space, lotchedwa photonic Rushberg effect.
Magulu awiri a Q symmetric (quasi) bound states mu continuum, omwe ndi ±K(Brillouin band Angle) photon spin valleys m'mphepete mwa nthambi zogawanika za spin, amapanga contemporary superposition ya amplitudes yofanana.
Pulofesa Koren anati: “Tinagwiritsa ntchito ma monolide a WS2 ngati zinthu zopezera phindu chifukwa chakuti disulfide iyi yachitsulo chosinthira cha band-gap ili ndi mawonekedwe apadera a chigwa cha pseudo-spin ndipo yaphunziridwa kwambiri ngati njira ina yonyamulira chidziwitso mu ma electron a chigwa. Makamaka, ma exciton awo a ±K 'valley (omwe amawala ngati ma planar spin-polarized dipole emitters) amatha kusangalatsidwa ndi kuwala kozungulira molingana ndi malamulo oyerekeza chigwa, motero amalamulira molimbika kuzungulira kopanda maginito.gwero la kuwala.
Mu chigwa chaching'ono cholumikizidwa ndi gawo limodzi, ma exciton a chigwa cha ±K 'amalumikizidwa ku ±K spin valley state mwa kufananiza polarization, ndipo spin exciton laser pa kutentha kwa chipinda imadziwika ndi kuwala kwamphamvu. Nthawi yomweyo,lasermakinawo amayendetsa ma excitons a chigwa cha ±K 'osadalira gawo loyamba kuti apeze momwe dongosololi lilili lotayika pang'ono ndikukhazikitsanso mgwirizano wa lock-in kutengera gawo la geometric moyang'anizana ndi chigwa cha ±K spin.
Kugwirizana kwa chigwa komwe kumayendetsedwa ndi makina a laser awa kumachotsa kufunikira kochepetsa kutentha kwa kufalikira kwa nthawi yochepa. Kuphatikiza apo, mkhalidwe wocheperako wa kutayika kwa laser ya Rashba monolayer ukhoza kusinthidwa ndi polarization ya pampu yolunjika (yozungulira), yomwe imapereka njira yowongolera mphamvu ya laser ndi mgwirizano wa malo.
Pulofesa Hasman akufotokoza kuti: “Zomwe zavumbulutsidwachithunziChigwa cha spin chigwa cha Rashba chimapereka njira yodziwika bwino yopangira magwero owonera a spin omwe amatuluka pamwamba. Kugwirizana kwa chigwa komwe kumawonetsedwa mu chigwa cha spin chomwe chili ndi gawo limodzi lolumikizidwa kumatibweretsera sitepe imodzi pafupi ndi kukwaniritsa kusakanikirana kwa chidziwitso cha quantum pakati pa excitons za ±K 'valley kudzera mu qubits.
Kwa nthawi yayitali, gulu lathu lakhala likupanga ma spin optics, pogwiritsa ntchito photon spin ngati chida chothandiza chowongolera machitidwe a mafunde a electromagnetic. Mu 2018, titachita chidwi ndi chigwa pseudo-spin mu zinthu zokhala ndi miyeso iwiri, tinayamba pulojekiti yayitali yofufuza momwe magwero a optical a atomic-scale spin alili popanda maginito. Timagwiritsa ntchito chitsanzo cha Berry phase defect chomwe sichili chapafupi kuti tithetse vuto lopeza coherent geometric phase kuchokera ku chigwa chimodzi.
Komabe, chifukwa cha kusowa kwa njira yolumikizirana yamphamvu pakati pa ma exciton, kuyika kogwirizana kwa ma exciton ambiri m'chigwa cha Rashuba komwe kwachitika sikunathetsedwebe. Vutoli limatilimbikitsa kuganizira za chitsanzo cha Rashuba cha ma photon okwera Q. Pambuyo popanga njira zatsopano zakuthupi, takhazikitsa laser ya Rashuba single-layer yomwe yafotokozedwa mu pepalali.
Kupambana kumeneku kwatsegula njira yophunzirira zochitika zokhudzana ndi mgwirizano wa spin m'magawo akale ndi a quantum, ndipo kwatsegula njira yatsopano yofufuzira ndi kugwiritsa ntchito zipangizo zamagetsi za spintronic ndi photonic optoelectronic.