magic angle

Gore rakapera, boka revasayendisiti rakapa migumisiro yetsvakurudzo yakakatyamadza nzanga yefizikisi. Zvakazoitika kuti mapepa egraphene atomu imwe chete gobvu anowana zvinoshamisa zvimiro kana achitenderedzwa pakona chaiyo "mashiripiti" nekuremekedza kune mumwe nemumwe (1).

Pamusangano waKurume weAmerican Physical Society muBoston, uko kwaizoburitswa ruzivo rwekutsvagisa mune iyi maonero, mhomho yesainzi yakaungana. Vamwe vanofunga nezvekuwanwa kwemasayendisiti paMassachusetts Institute of Technology kutanga kwenguva itsva.

Gore rapera boka renyanzvi dzefizikisi raitungamirirwa naPablo Jarillo-Herrero rakaisa mapepa egraphene pamusoro perimwe rimwe, rakatonhodza gadziriro yacho kusvika pedyo nezero yakakwana, uye rakatenderedza pepa rimwe pakona ye1,1 madhigirii kune rimwe. Vatsvakurudzi vakashandisa voltage, uye hurongwa hwakava rudzi rwe insulator, umo kupindirana pakati peatomu uye zvimedu zvinodzivirira maerekitironi kufamba. Sezvo mamwe maerekitironi akaiswa muhurongwa, hurongwa hwakava superconductor umo magetsi emagetsi aigona kufamba pasina kuramba..

— Jarillo-Herrero akaudza Gizmodo. -

Izvi zvemashiripiti zvinokonzerwa neangular rotation zvine hukama nezvinonzi maramba (moiré stripes). Iyi imhando yemhando yemitsara yakagadzirwa semhedzisiro (superposition) yemagridi maviri emitsara inotenderedzwa pane imwe kona kana kuisirwa deformation (yakakanganiswa maererano kune imwe neimwe). Kana, semuenzaniso, imwe mesh yakaiswa panzvimbo yakati sandara uye imwe mesh yakanamatira kune chinhu chakaremara, ipapo moiré fringes ichaonekwa. Maitiro avo anogona kuve akaomarara, uye nzvimbo yacho ichaenderana nekugadziriswa kwechinhu chiri kuedzwa.

Mhedzisiro yevatsvagiri veMIT yakadzokororwa nezvikwata zvakati wandei, kunyangwe ongororo ichiri kuenderera mberi uye vefizikisi vachiri kuongorora kukosha kwechiitiko ichi. Mugore rapfuura, anopfuura zana mapepa matsva pamusoro peiyi nyaya akaonekwa pane arXiv server. Ndakayeuka kuti theorists angangoita makore gumi apfuura akafanotaura kutaridzika kwemaitiro matsva emuviri mune dzakatenderedzwa uye dzakamonyoroka magraphene masisitimu. Nekudaro, vefizikisi havasati vanzwisisa mibvunzo mizhinji ine chekuita nekwakabva superconductivity phenomenon uye chimiro che dielectric states mugraphene.

Maererano naHarillo-Herrero, kufarira munyaya yacho kunokonzerwawo nekuti munguva pfupi yapfuura "kupisa" matavi efizikiki, i.e. graphene research uye zvimwe zvinhu zviviri-dimensional, topological properties zvinhu (unhu husingachinji kunyangwe shanduko yemuviri), super inotonhora nyaya uye zvinoshamisa electronic phenomenaiyo inomuka kubva munzira iyo maerekitironi anogoverwa mune zvimwe zvinhu.

Nekudaro, avo vari kunyanya kufara nezve kuwanikwa kutsva uye mashandisiro ayo anogona kuitika mumidziyo yemagetsi anotonhodzwa nezvimwe chokwadi. Semuenzaniso, mashiripiti angle graphene mapepa anofanirwa kuchengetedza tembiricha ye1,7 madhigirii Kelvin pamusoro pe zero yakazara, uye nekuwedzera, zvinoitika kuti "vanofarira" kusabatwa pakona ye1,1 madhigirii - kungofanana nemagineti maviri asingadi. kubata matanda mamwechete. Zvinonzwisisika zvakare kuti zvakaoma kushandisa chinhu chinongova atomu imwe gobvu.

Jarillo-Herrero akauya nezita remhedzisiro yaakawana ("twistronika"?, "rotnik"? - kana pamwe "moristors", kubva kumitsetse?). Zvinoita sekuti pachazodiwa zita nekuti vanhu vazhinji vesainzi neruzivo rwemichina vanoda kuferefeta chiitiko ichi uye kutsvaga maapplication acho.