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Qhov Sib Tshuam Lub Cev Thoob Ntiaj Teb Insulator Ntawm Graphene Nyob Hauv Tej Zwj

Raws li lub Massachusetts Institute ntawm Technology tsis ntev los no, lub tsev kawm ntawv cov kws tshawb fawb tau pom tias nyob hauv qee zaus, graphene yuav raug xa mus rau ib qho kev ua haujlwm ntawm cov saum toj kawg nkaus insulator, yuav tsum tau muab cov tswv yim tshiab rau kev tsim khoom ntawm quantum computers. Cov kev tshawb fawb no luam tawm lub lim tiam no hauv phau ntawv Journal.

Cov neeg soj ntsuam pom tau tias cov flakes daim nplaum tau tso rau hauv qhov chaw tsis muaj qhov kub thiab txias nrog 35 lub pob zeb Mesla magnetic thiab 0.3 degrees Celsius siab dua tshaj xoom. Cov qauv ntawm cov qauv graphene tuaj yeem hloov tau los tso cai rau nws mus lim electrons raws li kev coj ua ntawm electron spin, uas tsis yog tam sim no muaj nyob hauv ib qho hluav taws xob hluav taws xob system.

Raws li cov xwm txheej raug, graphene coj tus cwj pwm coj ua ib tus neeg ua haujlwm thiab ua rau muaj teeb meem rau nws, thiab lub sij hawm tam sim no dhau los ntawm nws. Tab sis yog ib daim graphene muab tso rau hauv ib qho chaw magnetic perpendicular rau nws, cov khoom hloov ntawm graphene hloov-qhov tam sim no tsuas yog sau raws cov npoo ntawm cov duab floral, thiab tus so ua insulators. Tsis tas li ntawd, qhov tam sim no tsuas yog tsiv mus nyob rau hauv ib qho kev coj ua raws li kev qhia ntawm kev sib nqus field. Qhov tshwm sim no hu ua quantum Hall effect.

Hauv txoj kev tshawb nrhiav, cov kws tshawb nrhiav tau pom tias yog tias koj ntxiv muaj zog magnetic teb mus rau txoj hauj lwm ntawm lub graphene nyob rau hauv cov ntaub ntawv saum toj no, cov khoom siv graphene yuav hloov dua tshiab: electrons tseem ua hauj lwm nkaus xwb ntawm cov npoo ntawm graphene, tab sis cov kev taw qhia ntawm cov kev lag luam yog hloov ntawm unidirectional rau bidirectional, thiab cov kev taw qhia tshwj xeeb yog txiav txim tau los ntawm cov lus qhia ntawm cov hluav taws xob sib txawv.

"Peb tau tsim ib qho tshwj xeeb neeg xyuas pib," said ib tug kws tshawb fawb postdoctoral ntawm MIT Physics department. Nws yog ib qho kev ua haujlwm ntawm sab qoob insulator kom cais cov electrons raws li electron tig kauj ruam. Txawm li cas los xij, lub graphene tsis yog ib qho tshuaj pleev kom tsis txhob muaj kabmob nyob rau hauv qhov kev txiav txim siab li niaj zaus. Peb muaj cov nyhuv tib yam hauv cov khoom sib txawv. Qhov tseem ceeb tshaj plaws, los ntawm kev hloov lub teb chaw magnetic, koj tuaj yeem nyob rau txhua lub sij hawm qhov kev siv hluav taws xob, lub hwj chim los yog tsis tswj lub xeev. Qhov no txhais tau hais tias lawv tuaj yeem ua rau circuits thiab transistors, uas tsis tau ua tiav. "

Erero, ib tug xibfwb nyob rau hauv MIT, tau hais tias muaj twv ntawm qhov kev paub ntawm graphene, tab sis tsis muaj leej twg tau ua nws tshwm sim. Txoj kev tshawb no ua ntej paub tseeb tias cov xim ntawm cov graphene rau spin electrons, thiab nws tau raug pov thawj rau thawj lub sij hawm uas graphene tswj tau cov kev taw qhia ntawm hluav taws xob thiab lub xeev ntawm hluav taws xob fais fab tuag los yog tsis. Qhov sim tau ua li cas qee cov neeg tshawb nrhiav tau ua kom tiav rau xyoo lawm tsis muaj kev vam meej, vam khom txoj kev tshiab los tsim cov quantum computers.

xib fwb ntawm physics hauv Massachusetts Lub Tsev Kawm Ntawv ntawm Kev Tshawb Fawb uas koom rau hauv txoj kev tshawb no, hais tias txoj kev tshawb no ua kom pom kev tshiab rau txoj kev kawm ntawm topological insulators. "Peb tsis tuaj yeem twv seb qhov kev tshawb nrhiav yuav ua rau, tab sis nws nthuav dav peb xav thiab muab cov khoom siv rau kev tsim ntau yam khoom," nws hais. "

said: "Vim tias qhov kev xav tau huab tsawg-kub thiab muaj zog magnetic ib puag ncig, kom ua tau raws li qhov no yuav tsum yooj yim, yog li cov tshuab uas tsim los ntawm quantum computer yuav yog ib qho khoom siv heev, yuav raug siv ua ntej rau qhov muaj feem cuam thawj haujlwm. " Tom ntej no, lawv yuav kuaj qhov graphene ntawm ib qho kev sib nqus magnetic field (1 Tesla) thiab rau siab dua, nrog saib kom txo tau qhov chaw pib rau kev siv tshuab.


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