Superconductivity yog kev tshwm sim ntawm lub cev uas hluav taws xob tiv thaiv cov khoom siv hluav taws xob txo qis rau xoom ntawm ib qho tseem ceeb kub. Lub Bardeen-Cooper-schriorfer (BCS) yog qhov piav qhia zoo, uas piav qhia txog cov khoom lag luam supercondivity hauv cov ntaub ntawv feem ntau. Nws taw qhia tias cov khub hluav taws xob no tau tsim nyob rau hauv lub crystal lattice ntawm ib qho kub txaus, thiab hais tias BCS superconductivity los ntawm lawv hws. Txawm hais tias graphene nws tus kheej yog ib qho hluav taws xob coj zoo, nws tsis pom BCS superconductivity vim kev sib txuam ntawm hluav taws xob-phonon sib cuam tshuam. Qhov no yog vim li cas feem ntau "ua zoo" (xws li kub thiab tooj liab) yog "tsis zoo" superconductors.
Cov kws tshawb nrhiav ntawm Chaw rau theoretical physics ntawm cov tshuab nyuaj (PCS) ntawm lub koom haum hloov tshiab kom ua tiav superconductivity hauv graphene. Lawv ua tiav qhov kev lom zem no los ntawm kev thov kom muaj hybrid system muaj ntawm graphene thiab ob-seem dee-einstein condensate (los). Cov kev tshawb fawb tau luam tawm nyob rau hauv phau ntawv journal 2d cov ntaub ntawv.
Ib txoj kev hybrid muaj cov roj hluav taws xob (sab saum toj txheej) nyob rau hauv graphene, sib cais los ntawm ob-seem thiab cov sawv cev ntawm kev tawm tsam (xiav thiab liab Cov tshuab hluav taws xob thiab cov yeeb yaj kiab hauv graphene tau txuas los ntawm coulombor.
(a) Kev vam khom qhov kub ntawm tus thawj coj ntawm tus txheej txheem loj hauv tebchaws (b) Qhov kub tseem ceeb ntawm superconducting kev hloov ua lub luag haujlwm ntawm cov kev sib txuas lus hauv cov kab mob me me) thiab tsis muaj (dub tawv kab) cua nab. Lub xiav dotted kab qhia cov kab kub bkt kub raws li kev ua haujlwm ntawm kev ua kom txaus siab.
Ntxiv nrog rau superconductivity, tshwm sim yog lwm qhov tshwm sim uas tshwm sim ntawm qhov kub tsawg. Nws yog lub xeev tsib ntawm teeb meem ua ntej kwv yees los ntawm Einstein hauv 1924. Qhov kev tsim hluav taws xob ua ke thaum muaj teeb meem dav dav hauv kev ua kom muaj teeb meem. Lub hybrid bose-fermi system tseem ceeb sawv cev rau txheej txheej ntawm ib txheej ntawm cov tshuab hluav taws xob, xws li cov yeeb yaj kiab uas tsis ncaj, thiab lwm yam. Qhov kev sib cuam tshuam ntawm bose thiab fermi hais coj mus rau ntau yam dab neeg tshiab thiab txaus nyiam qhov tshwm sim, uas ua rau muaj kev txaus siab ntawm ob tog. Theem pib thiab thov-qhia.
Hauv txoj haujlwm no, cov kws tshawb nrhiav tau tshaj tawm lub tshuab hluav taws xob tshiab hauv graphene, uas yog vim muaj hluav taws xob thiab "bogolons" ntau dua li cov suab nrov hauv lub kaw lus BCS raug. Bogolons lossis Bogoliubov qascusicles yog kev lom zem hauv kev kis, uas muaj qee yam cwj pwm ntawm cov me me. Tsis pub dhau qee qhov kev ntsuas tsis pub dhau, cov kev siv tshuab no tso cai rau superconducting qhov tseem ceeb kub hauv graphene mus cuag kom siab npaum li 70 kelvin. Cov kws tshawb nrhiav kuj tau tsim cov ntawv me me tshiab ntawm cov ntawv uas muaj kev cuam tshuam rau cov tshuab raws li cov duab tshiab tshiab. Tus qauv lawv tau thov tau hais tias cov khoom lag luam superconducting tuaj yeem nce nrog kub thiab kub nyob ntawm qhov sib txawv ntawm superconducting ntawm superconducting sib txawv.
Ib qho ntxiv, cov kev tshawb fawb tau pom tias Dirac Dispersion ntawm Graphene tau tshwj tseg hauv cov phiaj xwm bogolon no. Qhov no qhia tau tias lub superconducting tshuab hluav taws xob cuam tshuam nrog cov hluav taws xob nrog cov hluav taws xob tsis sib xws, thiab qhov tshwm sim no tsis tau pom zoo hauv cov teeb meem condensed hauv kev ua kom muaj teeb meem.
Txoj hauj lwm no qhia lwm txoj hauv kev kom ua tiav qib siab superconductivity. Nyob rau tib lub sijhawm, los ntawm kev tswj hwm cov khoom ntawm cov condensate, peb tuaj yeem kho qhov superconductivity ntawm graphene. Qhov no qhia lwm txoj hauv kev los tswj cov khoom siv superconducting rau yav tom ntej.
Lub Sijhawm Post: Jul-16-2021 
