Cov kws tshawb fawb ntawm CRANN (Lub Chaw rau Kev Tshawb Fawb Txog Kev Hloov Kho Nanostructures thiab Nanodevices), thiab Tsev Kawm Ntawv ntawm Physics ntawm Trinity College Dublin, hnub no tshaj tawm tias acov khoom siv sib nqustsim tawm ntawm Lub Chaw qhia txog qhov kev hloov pauv magnetic ceev tshaj plaws puas tau sau tseg.
Cov pab pawg neeg tau siv cov tshuab laser femtosecond hauv Photonics Research Laboratory ntawm CRANN los hloov thiab tom qab ntawd rov hloov qhov kev taw qhia magnetic ntawm lawv cov khoom hauv trillionths ntawm ib pliag, rau npaug sai dua li cov ntaub ntawv dhau los, thiab ib puas npaug sai dua li lub moos ceev ntawm lub khoos phis tawj tus kheej.
Qhov kev tshawb pom no qhia txog lub peev xwm ntawm cov khoom siv rau ib tiam tshiab ntawm cov khoos phis tawj ceev ceev thiab cov tshuab khaws cia cov ntaub ntawv.
Cov kws tshawb nrhiav tau ua tiav lawv qhov kev hloov pauv ceev uas tsis tau muaj dua hauv cov hlau hu ua MRG, thawj zaug tsim los ntawm pawg neeg hauv xyoo 2014 los ntawm manganese, ruthenium thiab gallium. Hauv kev sim, pab pawg neeg tau ntaus cov zaj duab xis nyias ntawm MRG nrog cov teeb liab laser tawg, xa megawatts ntawm lub zog hauv tsawg dua ib billionth ntawm ib pliag.
Qhov kev hloov pauv cua sov hloov qhov kev taw qhia ntawm lub hlau nplaum ntawm MRG. Nws siv sijhawm ib feem kaum ntawm picosecond sai heev kom ua tiav qhov kev hloov pauv thawj zaug no (1 ps = ib trillionth ntawm ib pliag). Tab sis, qhov tseem ceeb dua, pab neeg tau pom tias lawv tuaj yeem hloov qhov kev taw qhia rov qab dua 10 trillionths ntawm ib pliag tom qab. Qhov no yog qhov kev hloov pauv sai tshaj plaws ntawm qhov kev taw qhia ntawm lub hlau nplaum puas tau pom.
Lawv cov txiaj ntsig tau muab luam tawm lub lim tiam no hauv phau ntawv xov xwm physics tseem ceeb, Physical Review Letters.
Qhov kev tshawb pom no yuav qhib tau txoj hauv kev tshiab rau kev siv tshuab computer thiab kev siv tshuab xov xwm tshiab, vim qhov tseem ceeb ntawmcov khoom siv sib nquss hauv kev lag luam no. Zais cia rau hauv ntau yam ntawm peb cov khoom siv hluav taws xob, nrog rau hauv cov chaw khaws ntaub ntawv loj hauv plawv ntawm internet, cov ntaub ntawv sib nqus nyeem thiab khaws cov ntaub ntawv. Kev tawg ntawm cov ntaub ntawv tam sim no tsim cov ntaub ntawv ntau dua thiab siv zog ntau dua li yav dhau los. Kev nrhiav txoj hauv kev tshiab siv hluav taws xob zoo los tswj cov ntaub ntawv, thiab cov ntaub ntawv kom phim, yog kev tshawb fawb thoob ntiaj teb.
Tus yuam sij rau pab pawg Trinity txoj kev vam meej yog lawv lub peev xwm los ua tiav qhov kev hloov pauv sai heev yam tsis muaj lub zog sib nqus. Kev hloov pauv ib txwm muaj ntawm lub hlau nplaum siv lwm lub hlau nplaum, uas los ntawm tus nqi hauv cov nqe lus ntawm lub zog thiab lub sijhawm. Nrog MRG qhov kev hloov pauv tau ua tiav nrog lub zog cua sov, ua rau siv cov khoom siv sib cuam tshuam nrog lub teeb.
Cov kws tshawb fawb ntawm Trinity Jean Besbas thiab Karsten Rode tham txog ib txoj hauv kev ntawm kev tshawb fawb:
"Cov khoom siv sib nquss muaj lub cim xeeb uas siv tau rau kev xav. Txog tam sim no, kev hloov ntawm ib lub xeev sib nqus 'kev xav 0,' mus rau lwm qhov 'kev xav 1,' tau siv zog ntau dhau thiab qeeb dhau. Peb txoj kev tshawb fawb hais txog kev ceev los ntawm kev qhia tias peb tuaj yeem hloov MRG los ntawm ib lub xeev mus rau lwm qhov hauv 0.1 picoseconds thiab qhov tseem ceeb yog tias qhov hloov thib ob tuaj yeem ua raws li 10 picoseconds tom qab, sib raug rau qhov zaus ua haujlwm ntawm ~ 100 gigahertz - sai dua li txhua yam uas tau pom ua ntej.
"Qhov kev tshawb pom no qhia txog lub peev xwm tshwj xeeb ntawm peb lub MRG los txuas lub teeb thiab tig kom zoo kom peb thiaj li tswj tau lub zog magnetism nrog lub teeb thiab lub teeb nrog lub zog magnetism ntawm lub sijhawm uas tseem tsis tau ua tiav."
Thaum nws hais txog nws pab neeg txoj haujlwm, Xibfwb Michael Coey, Trinity's School of Physics thiab CRANN, tau hais tias, "Xyoo 2014 thaum kuv pab neeg thiab kuv thawj zaug tshaj tawm tias peb tau tsim cov hlau nplaum tshiab ntawm manganese, ruthenium thiab gallium, hu ua MRG, peb yeej tsis tau xav tias cov khoom siv muaj lub peev xwm magneto-optical zoo kawg li no."
"Qhov kev qhia no yuav ua rau muaj cov tswv yim tshiab ntawm cov cuab yeej siv raws li lub teeb thiab lub zog magnetic uas yuav tau txais txiaj ntsig los ntawm kev ua kom ceev thiab siv hluav taws xob zoo dua, tej zaum thaum kawg yuav ua tiav ib lub cuab yeej siv thoob ntiaj teb nrog kev ua haujlwm ntawm lub cim xeeb thiab kev xav. Nws yog ib qho kev sib tw loj heev, tab sis peb tau qhia txog cov khoom siv uas yuav ua rau nws ua tau. Peb vam tias yuav tau txais nyiaj txiag thiab kev koom tes hauv kev lag luam los ua peb txoj haujlwm."
Lub sijhawm tshaj tawm: Tsib Hlis-05-2021