X-ray emission los ntawm cov hluav taws xob dawb impinging ntawm van der Waals khoom.Credit: Technion - Israel lub koom haum thev naus laus zis
Cov kws tshawb fawb Technion tau tsim cov hluav taws xob muaj tseeb uas xav tias yuav ua rau muaj kev cuam tshuam hauv kev kho mob thiab lwm qhov chaw.Lawv tau tsim cov khoom siv hluav taws xob muaj tseeb uas tuaj yeem hloov cov chaw kim thiab cumbersome tam sim no siv rau cov haujlwm no.Cov cuab yeej tawm tswv yim tsim cov hluav taws xob tswj nrog qhov nqaim spectrum uas tuaj yeem hloov kho nrog kev daws teeb meem siab, ntawm kev nqis peev tsawg zog.Cov kev tshawb pom no yuav ua rau muaj kev cuam tshuam hauv ntau qhov chaw, suav nrog kev txheeb xyuas cov tshuaj lom neeg thiab cov khoom siv lom neeg, kev tshuaj xyuas kev kho mob, cov khoom siv X-ray rau kev soj ntsuam kev ruaj ntseg, thiab lwm yam kev siv X-ray qhov tseeb.

Tshaj tawm nyob rau hauv phau ntawv journal Nature Photonics, txoj kev tshawb no tau coj los ntawm xibfwb Ido Kaminer thiab nws tus tswv tus tub ntxhais kawm Michael Shentcis ua ib feem ntawm kev koom tes nrog ntau lub koom haum tshawb fawb ntawm Technion: Andrew thiab Erna Viterbi Kws Qhia Ntawv ntawm Hluav Taws Xob Engineering, Lub Tsev Haujlwm Solid State, Russell Berrie Nanotechnology Institute (RBNI), thiab Helen Diller Center rau Quantum Science, Matter thiab Engineering.

Cov kws tshawb fawb cov ntawv qhia qhia txog kev soj ntsuam kev soj ntsuam uas muab thawj qhov pov thawj-ntawm-lub tswv yim rau cov qauv theoretical tsim nyob rau hauv kaum xyoo dhau los hauv cov kab lus sib txuas.Thawj tsab xov xwm ntawm qhov kev kawm kuj tau tshwm sim hauv Nature Photonics.Sau los ntawm Prof. Kaminer thaum lub sij hawm nws postdoc ntawm MIT, nyob rau hauv kev saib xyuas ntawm Prof. Marin Soljacic thiab Prof. John Joannopoulos, daim ntawv qhia theoretically yuav ua li cas ob-dimensional cov ntaub ntawv muaj peev xwm tsim X-rays.Raws li Prof. Kaminer, "Cov kab lus ntawd tau cim qhov pib ntawm kev taug kev mus rau cov khoom siv hluav taws xob raws li cov khoom siv hluav taws xob tshwj xeeb ntawm cov khoom siv ob sab thiab lawv ntau qhov sib txuas-heterostructures.Peb tau tsim los ntawm theoretical breakthrough los ntawm tsab xov xwm no los tsim cov kab lus txuas ntxiv, thiab tam sim no, peb zoo siab tshaj tawm thawj qhov kev soj ntsuam ntawm kev tsim cov hluav taws xob xoo hluav taws xob los ntawm cov ntaub ntawv zoo li no, thaum tswj cov hluav taws xob tsis zoo. ”

Cov khoom siv ob sab yog cov qauv tsim tshwj xeeb uas coj lub zej zog kev tshawb fawb los ntawm cua daj cua dub nyob rau xyoo 2004 nrog kev txhim kho ntawm graphene los ntawm physicists Andre Geim thiab Konstantin Novoselov, uas tom qab ntawd yeej qhov khoom plig Nobel hauv Physics hauv xyoo 2010. Graphene yog ib qho khoom siv dag zog ntawm ib qho khoom plig. ib qho atomic thickness ua los ntawm carbon atoms.Thawj cov qauv graphene tau tsim los ntawm ob tus Nobel laureates los ntawm kev tshem tawm cov txheej nyias ntawm graphite, "sau cov ntaub ntawv" ntawm xaum, siv cov kab xev.Ob tus kws tshawb fawb thiab cov kws tshawb fawb tom qab tau tshawb pom tias graphene muaj cov khoom tshwj xeeb thiab xav tsis thoob uas txawv ntawm cov khoom siv graphite: lub zog loj, yuav luag tiav pob tshab, hluav taws xob conductivity, thiab lub teeb xa hluav taws xob muaj peev xwm tso cai rau hluav taws xob emission-ib yam ntsig txog cov kab lus tam sim no.Cov yam ntxwv tshwj xeeb no ua rau graphene thiab lwm yam khoom siv ob sab uas tau cog lus rau yav tom ntej ntawm cov tshuaj lom neeg thiab cov khoom siv roj ntsha, lub hnub ci hlwb, cov khoom siv hluav taws xob, cov saib, thiab lwm yam.

Lwm tus Nobel laureate uas yuav tsum tau hais ua ntej rov qab mus rau qhov kev tshawb fawb tam sim no yog Johannes Diderik van der Waals, uas tau yeej Nobel nqi zog hauv Physics raws nraim ib puas xyoo dhau los, hauv 1910. Cov ntaub ntawv tam sim no muaj npe tom qab nws-vdW cov ntaub ntawv-yog qhov tseem ceeb ntawm Prof. Kaminer txoj kev tshawb fawb.Graphene kuj yog ib qho piv txwv ntawm cov khoom siv vdW, tab sis txoj kev tshawb fawb tshiab tam sim no pom tias lwm cov ntaub ntawv vdW siab heev yog qhov muaj txiaj ntsig zoo rau lub hom phiaj ntawm kev tsim X-rays.Cov kws tshawb fawb Technion tau tsim cov ntaub ntawv vdW sib txawv thiab xa cov kab hluav taws xob los ntawm lawv ntawm cov ces kaum tshwj xeeb uas ua rau X-ray emission nyob rau hauv kev tswj hwm thiab raug.Tsis tas li ntawd, cov kws tshawb fawb tau qhia meej meej ntawm cov hluav taws xob spectrum ntawm kev daws teeb meem tsis tau pom dua, siv qhov yooj yim hauv kev tsim tsev neeg ntawm vdW cov ntaub ntawv.

Cov kab lus tshiab los ntawm pab pawg tshawb fawb muaj cov txiaj ntsig kev sim thiab cov kev xav tshiab uas ua ke muab cov pov thawj ntawm lub tswv yim rau kev siv tshiab ntawm cov khoom siv ob sab ua ib qho kev sib cog lus uas tsim hluav taws xob tswj tau thiab raug.

"Qhov kev sim thiab txoj kev xav uas peb tau tsim los piav qhia nws ua rau muaj txiaj ntsig zoo rau kev kawm txog kev sib cuam tshuam ntawm lub teeb thiab ua rau txoj hauv kev rau ntau yam kev siv hauv X-ray duab (kev kho mob X-ray, piv txwv li), X-ray spectroscopy siv. txhawm rau txheeb xyuas cov ntaub ntawv, thiab yav tom ntej quantum teeb qhov chaw hauv X-ray tswj hwm, "said Prof. Kaminer.