Nyob rau hauv cov ntaub ntawv superconducting, ib qho hluav taws xob tam sim no yuav ntws yam tsis muaj kev tiv thaiv. Muaj ob peb lub tswv yim ntawm qhov tshwm sim no; Txawm li cas los xij, ntau cov lus nug tseem ceeb tseem tsis tau teb. Associate Professor Justin Ye, lub taub hau ntawm Lub Tshuab Physics ntawm Complex Materials pab pawg ntawm University of Groningen, tau kawm superconductivity nyob rau hauv ob txheej ntawm molybdenum disulfide thiab nrhiav pom tshiab superconducting xeev. Cov txiaj ntsig tau tshaj tawm hauv phau ntawv journal Nature Nanotechnology thaum Lub Kaum Ib Hlis 4.

Superconductivity tau pom nyob rau hauv monolayer crystals ntawm, piv txwv li, molybdenum disulphide los yog tungsten disulfide uas muaj ib tug tuab ntawm peb atoms. "Nyob rau hauv ob qho tib si monolayers, muaj ib hom tshwj xeeb ntawm superconductivity nyob rau hauv uas ib sab hauv magnetic teb tiv thaiv lub xeev superconducting los ntawm sab nraud magnetic teb," Ye piav qhia. Ib txwm superconductivity ploj mus thaum siv cov hlau nplaum sab nraud loj, tab sis Ising superconductivity no muaj kev tiv thaiv zoo. Txawm tias nyob rau hauv lub zog zoo li qub magnetic teb nyob rau hauv cov teb chaws Europe, uas muaj ib tug muaj zog ntawm 37 Tesla, lub superconductivity nyob rau hauv tungsten disulfide tsis muaj kev hloov. Txawm li cas los xij, txawm hais tias nws zoo heev kom muaj kev tiv thaiv zoo li no, qhov kev sib tw tom ntej yog nrhiav txoj hauv kev los tswj qhov kev tiv thaiv no, los ntawm kev siv hluav taws xob.

New superconducting xeev

Ye thiab nws cov neeg koom tes tau kawm txog ob txheej ntawm molybdenum disulfide: "Nyob rau hauv qhov kev teeb tsa, kev sib cuam tshuam ntawm ob txheej ua rau lub xeev superconducting tshiab." Koj tau tsim cov txheej txheem ob txheej, nrog cov kua ionic ntawm ob sab uas tuaj yeem siv los tsim hluav taws xob thoob plaws lub bilayer. "Nyob rau hauv tus kheej monolayer, xws li ib daim teb yuav asymmetric, nrog zoo ions ntawm ib sab thiab tsis zoo nqi induced rau lwm yam. Txawm li cas los xij, hauv bilayer, peb tuaj yeem muaj qhov sib npaug ntawm tus nqi cuam tshuam ntawm ob qho tib si monolayers, tsim kom muaj qhov sib luag, "Ye piav qhia. Lub teb hluav taws xob uas tau tsim yog li no tuaj yeem siv los hloov superconductivity rau thiab tawm. Qhov no txhais tau hais tias lub superconducting transistor tau tsim uas tuaj yeem nkag los ntawm cov kua ionic.

Nyob rau hauv ob txheej, Ising tiv thaiv sab nraud magnetic teb disappears. "Qhov no tshwm sim vim muaj kev hloov pauv hauv kev sib cuam tshuam ntawm ob txheej." Txawm li cas los xij, hluav taws xob teb tuaj yeem rov qab tiv thaiv. "Kev tiv thaiv qib dhau los ua haujlwm ntawm koj lub rooj vag lub cuab yeej muaj zog npaum li cas."

Cooper ua khub

Sib nrug los ntawm kev tsim lub superconducting transistor, Ye thiab nws cov npoj yaig tau ua lwm qhov kev soj ntsuam zoo. Xyoo 1964, lub xeev tshwj xeeb superconducting tau kwv yees tias muaj, hu ua FFLO xeev (npe tom qab cov kws tshawb fawb uas tau kwv yees nws: Fulde, Ferrell, Larkin thiab Ovchinnikov). Nyob rau hauv superconductivity, electrons taug kev nyob rau hauv khub nyob rau hauv opposite lus qhia. Txij li thaum lawv taug kev ntawm tib lub nrawm, cov khub Cooper no muaj tag nrho lub zog kinetic ntawm xoom. Tab sis nyob rau hauv lub xeev FFLO, muaj qhov sib txawv me me thiab yog li lub zog kinetic tsis yog xoom. Txog tam sim no, lub xeev no tsis tau kawm kom raug hauv kev sim.

"Peb tau ntsib yuav luag txhua qhov yuav tsum tau ua ua ntej los npaj FFLO lub xeev hauv peb lub cuab yeej," Ye hais. "Tab sis lub xeev muaj zog heev thiab cuam tshuam loj heev los ntawm kev sib kis ntawm peb cov khoom. Yog li ntawd, peb yuav tsum rov ua qhov kev sim nrog cov qauv huv huv. "

Nrog rau kev tshem tawm bilayer ntawm molybdenum disulfide, Ye thiab cov neeg koom tes muaj tag nrho cov khoom xyaw uas xav tau los kawm qee lub xeev tshwj xeeb superconducting. "Qhov no yog qhov kev tshawb fawb tiag tiag uas yuav ua rau peb hloov lub tswv yim."