Ụwa ọhụrụ nke ngwaọrụ optoelectronic

Ụwa ọhụrụ nkengwaọrụ optoelectronic

Ndị nchọpụta na Technion-Israel Institute of Technology emepụtala ntụgharị a na-achịkwa nke ọmalaser anyadabere na otu oyi akwa atọm. Nchọpụta a mere ka o kwe omume site na mmekọrịta dị n'etiti otu oyi akwa atọm na eriri ntụgharị fotonic nke kwụ ọtọ, nke na-akwado ndagwurugwu ntụgharị Q dị elu site na nkewa nke foton nke ọnọdụ ejikọtara na continuum.
Nsonaazụ ahụ, nke e bipụtara na Nature Materials ma gosipụta ya na obere nnyocha ya, na-emeghe ụzọ maka ọmụmụ ihe gbasara ihe ndị metụtara spin-related na klasịk nasistemụ kwantum, ma mepee ụzọ ọhụrụ maka nyocha dị mkpa na ojiji nke elektrọn na photon spin na ngwaọrụ optoelectronic. Isi iyi anya spin na-ejikọta ọnọdụ photon na mgbanwe elektrọn, nke na-enye ụzọ maka ịmụ mgbanwe ozi spin n'etiti elektrọn na photon na ịmepụta ngwaọrụ optoelectronic dị elu.

A na-arụ obere oghere anya Spin Valley site na ijikọta eriri photonic spin na asymmetry inversion (mpaghara isi odo odo) na inversion symmetry (mpaghara cyan cladding).
Iji wulite isi mmalite ndị a, ihe dị mkpa bụ iwepụ mmebi nke spin n'etiti ọnọdụ spin abụọ dị iche na akụkụ photon ma ọ bụ elektrọn. A na-enweta nke a site n'itinye ubi magnet n'okpuru mmetụta Faraday ma ọ bụ Zeeman, ọ bụ ezie na usoro ndị a na-achọkarị ubi magnet siri ike ma enweghị ike ịmepụta microsource. Ụzọ ọzọ na-ekwe nkwa dabere na sistemụ igwefoto geometric nke na-eji ubi magnet arụrụ arụ iji mepụta ọnọdụ spin-split nke photons na oghere momentum.
N'ụzọ dị mwute, ihe ndị a chọpụtara n'oge gara aga gbasara ọnọdụ nkewa nke spin dabere nke ukwuu na ụdị mgbasa ozi ihe dị ala, nke na-etinye mmachi na njikọ oghere na oge nke isi mmalite. Ụzọ a na-egbochikwa site na ọdịdị nke ihe ndị na-egbochi laser, nke enweghị ike iji ma ọ bụ enweghị ike iji ya chịkwaa nke ọma.isi mmalite ọkụ, ọkachasị na enweghị ebe ndọta na okpomọkụ ụlọ.
Iji nweta ọnọdụ nkewa dị elu nke Q, ndị nchọpụta ahụ wuru eriri ntụgharị photonic nwere ụdị dị iche iche, gụnyere isi nwere asymmetry inversion na envelopu symmetric inversion nke ejiri otu oyi akwa WS2 mee, iji mepụta ndagwurugwu spin nke nwere oke mgbochi. Lattice inverse asymmetric nke ndị nchọpụta ji eme ihe nwere ihe abụọ dị mkpa.
Vektọ lattice nke a na-achịkwa nke na-adabere na spin-dependent reciprocal nke sitere na mgbanwe oghere geometric nke nanoporous anisotropic dị iche iche nke ha mejupụtara. Vektọ a na-ekewa band spin degeneration n'ime alaka abụọ spin-polarized na oghere momentum, nke a maara dị ka mmetụta photonic Rushberg.
N'ime usoro njikọ ahụ, ụzọ abụọ nke nwere njikọ Q dị elu (quasi) dị n'etiti, ya bụ ±K (Brillouin band Angle) nke nwere oghere photon spin dị n'akụkụ alaka ndị na-ekewa, na-emepụta njikọ kwụ ọtọ nke nha nhata.
Prọfesọ Koren kwuru, sị: “Anyị jiri WS2 monolides mee ihe dị ka ihe bara uru n'ihi na disulfide ígwè mgbanwe band-gap a nwere pseudo-spin pụrụ iche na ndagwurugwu ma amụọla ya nke ọma dị ka ihe ọzọ na-ebu ozi na elektrọn ndagwurugwu. N'ụzọ pụrụ iche, enwere ike iji ±K 'valley excitons ha (nke na-enwu n'ụdị planar spin-polarized dipole emitters) mee ka ìhè spin-polarized nwee mmasị dịka iwu nhọrọ ntụnyere ndagwurugwu si dị, si otú a na-achịkwa ntụgharị na-enweghị magnetically.isi iyi ngwa anya.
N'ime obere oghere spin Valley nke nwere otu oyi akwa jikọtara ọnụ, a na-ejikọ excitons ±K 'valley na steeti spin Valley ±K site na njikọta polarization, a na-enwetakwa laser spin exciton na okpomọkụ ụlọ site na nzaghachi ọkụ siri ike. N'otu oge ahụ,laserusoro ahụ na-akpali excitons ndagwurugwu nke na-adabereghị na ọkwa mbụ nke ±K iji chọta ọnọdụ mfu kacha nta nke sistemụ ahụ wee guzobe njikọ mkpọchi ahụ dabere na usoro geometric dị n'ihu ndagwurugwu ntụgharị ±K.
Njikọta ndagwurugwu nke usoro laser a na-akwalite na-ewepụ mkpa ọ dị igbochi obere okpomọkụ nke mgbasa ozi oge ụfọdụ. Na mgbakwunye, enwere ike ịgbanwe ọnọdụ mfu kacha nta nke laser monolayer Rashba site na polarization nke linear (circular), nke na-enye ụzọ isi chịkwaa ike laser na njikọ oghere.
Prọfesọ Hasman kọwara, sị: “Ihe e kpughere ekpugherefotonikMmetụta nke spin Valley Rashba na-enye usoro izugbe maka iwulite isi iyi anya spin na-ewepụta elu. Njikọta ndagwurugwu egosiri na obere oghere spin Valley agbakwunyere otu oyi akwa na-eme ka anyị bịaruo nso iji nweta njikọ ozi quantum n'etiti ±K 'valley excitons site na qubits.
Ruo ogologo oge, ndị otu anyị anọwo na-emepụta oghere ntụgharị, na-eji photon spin dị ka ngwa ọrụ dị irè maka ijikwa omume nke ebili mmiri electromagnetic. Na 2018, ebe anyị nwere mmasị na oghere pseudo-spin na ihe abụọ nwere akụkụ, anyị malitere ọrụ ogologo oge iji nyochaa njikwa na-arụ ọrụ nke isi mmalite oghere ntụgharị atomic na-enweghị ubi magnet. Anyị na-eji ụdị ntụpọ berry nke na-abụghị nke mpaghara iji dozie nsogbu nke inweta usoro geometric coherent site na otu exciton ndagwurugwu.
Agbanyeghị, n'ihi enweghị usoro mmekọrịta siri ike n'etiti excitons, njikọ dị n'etiti ọtụtụ excitons ndagwurugwu na isi iyi ọkụ otu oyi akwa Rashuba nke enwetara ka edozibeghị. Nsogbu a na-akpali anyị iche echiche banyere ụdị Rashuba nke foton Q dị elu. Mgbe anyị mepụtara ụzọ anụ ahụ ọhụrụ, anyị etinyela laser otu oyi akwa Rashuba nke akọwara n'akwụkwọ a.
Mmezu a na-emeghe ụzọ maka ọmụmụ ihe gbasara njikọ njikọ dị n'etiti ihe ndị dị n'otu na mpaghara klọntum, ma na-emepe ụzọ ọhụrụ maka nyocha na ojiji nke ngwaọrụ optoelectronic spintronic na photonic.