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The Variable Body Topological Insulator Of Graphene Under Certain Conditions According to the Massachusetts Institute of Technology website recently, the school scientists found that in some extreme cases, graphene can be converted into a unique function of the topological insulator, is expected to provide new ideas for the manufacture of quantum computers. The research is published this week in the journal Nature. The researchers found that the graphene flakes were placed in a low temperature environment with a strength of 35 Tesla magnetic field and 0.3 degrees Celsius higher than absolute zero. The conductive properties of graphene can be changed to allow it to filter electrons according to the direction of the electron spin, which is not currently available in any traditional electronic system. Under typical conditions, graphene behaves as a normal conductor and exerts a voltage on it, and the current passes through it. But if a piece of graphene is placed in a magnetic field perpendicular to it, the properties of graphene change-the current only runs along the edges of graphene flakes, and the rest becomes insulators. In addition, the current will only move in one direction according to the direction of the magnetic field. This phenomenon is called the quantum Hall effect. In the new study, the researchers found that if you add a strong magnetic field to the position of the graphene in the above case, the properties of graphene will change again: electrons still operate only along the edges of graphene, but the direction of the operation is changed from unidirectional to bidirectional, and the specific direction is determined by the different directions of the electron spin. "We created an unusual special conductor," said a postdoctoral researcher at MIT's Physics department. It is a common function of the topological insulator to separate electrons according to the electron spin direction. However, graphene is not a topological insulator in the usual sense. We have the same effect in different material systems. More importantly, by changing the magnetic field, you can also at any time the direction of the electronic operation, power or not to control the state. This means that they can be made into circuits and transistors, which have not been achieved before. Erero, an associate professor at MIT, said there had been predictions of this characterization of graphene, but no one had ever made it happen. The study first confirmed the selectivity of graphene to spin electrons, and it has been proved for the first time that graphene can control the direction of electronic operation and the state of electric power or not. The experiment has done what some researchers have been trying to achieve for decades without success, promising a new way to create quantum computers. professor of physics at the Massachusetts Institute of Technology who participates in the study, says the study paints a new direction for the study of topological insulators. "We cannot predict what the findings will lead to, but it broadens our thinking and provides possibilities for the manufacture of multiple devices," he said. said: "Because of the need for extreme low-temperature and strong magnetic environment, to achieve such a requirement is not easy, so the technology produced by the quantum computer will be a very professional equipment, may be used first for high-priority computing tasks." Next, they will test the performance of graphene at a lower magnetic field (1 Tesla) and at higher temperatures, with a view to reducing the threshold for the technology.
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Varijable tijelo topološki izolator rešetku pod određenim uvjetima Prema web stranici Massachusetts Institute of Technology nedavno, škola znanstvenici su otkrili da u nekim ekstremnim slučajevima rešetku može se pretvoriti u jedinstvenu funkciju topološki izolator, očekuje se da će dati nove ideje za proizvodnju Kvantna računala. Istraživanje objavljeno ovog tjedna u časopisu Nature. Istraživači su otkrili da rešetku pahuljice su bili smješteni u niskoj temperaturi snaga 35 Tesla magnetsko polje i 0,3 stupnjeva iznad apsolutne nule. Provodljivog svojstva rešetku može se dopustiti da filtrirati elektrona prema smjeru elektron spin, što nije trenutno dostupan na bilo koji tradicionalni elektronički sustav. U uobičajenim uvjetima, rešetku ponaša kao normalan dirigent i djeluje napon na njemu, a struja prolazi kroz to. Ali ako komad rešetku se nalazi u magnetsko polje okomito na to, svojstva rešetku promjena na tekućem pokreće samo uz rubove rešetku pahuljice, a ostatak postaje izolatori. Osim toga, struja će premjestiti samo u jednom smjeru prema smjeru magnetskog polja. Ovaj fenomen se naziva kvantni Hallov efekt. U novoj studiji, istraživači su otkrili ako dodate jakih magnetskih polja na mjesto rešetku u gornjem slučaju, svojstva rešetku će promijeniti opet: elektroni još rade samo uz rubove rešetku, ali smjer operacije Chanel from jednosmjerni dvosmjeran i određeni smjer određen je različitim smjerovima spina elektrona. "Stvorili smo neobično poseban vodič," rekao je postdoktorski istraživač na MIT fiziku. To je zajednička funkcija topološki izolator za odvajanje elektrona prema smjeru vrtnje elektrona. Međutim, rešetku nije topološki izolator u uobičajenom smislu. Imamo isti učinak različitih materijala sustava. Još važnije, promjenom magnetskog polja također možete u bilo kojem trenutku smjeru elektroničke operacije, moć ili ne kontrolira država. To znači da oni mogu biti izrađene u sklopove i tranzistora, koji nisu ostvareni prije. Erero, profesor na MIT-u, rekao je bilo predviđanja ova karakterizacija rešetku, ali nitko to nije napravio. Studija prvi put potvrđena selektivnost rešetku spin elektrona, i dokazano je za prvi put tu rešetku može kontrolirati smjer elektroničke i stanje električne energije ili ne. Eksperiment je učinio ono što neki istraživači pokušavaju postići već desetljećima bezuspješno, obećavajući novi način za stvaranje kvantnih računala. profesor fizike na Massachusetts Institute of Technology koji sudjeluje u istraživanju, kaže studija boje novi smjer za proučavanje topološki izolatori. "Ne možemo predvidjeti što zaključci će dovesti do, ali proširuje naše razmišljanje i pruža mogućnosti za proizvodnju više uređaja," rekao je. Rekao je: "zbog potrebe za ekstremno niske temperature i jakim magnetskim okoliš, kako bi se postigla takav zahtjev nije lako, tako tehnologija u produkciji kvantni kompjuter će biti vrlo profesionalnu opremu, mogu se koristiti prvi put za prioritetna računalnih zadataka." Dalje, oni će testirati performanse rešetku na donjem magnetsko polje (1 Tesla) i na višim temperaturama, s ciljem smanjivanja praga za tehnologiju.