According to a report from the Massachusetts Institute of Technology website recently, scientists at the university discovered that under certain extreme conditions, graphene can be converted into a topological insulator with unique functions, which is expected to provide new ideas for the manufacture of quantum computers. The relevant research was published in the magazine "Nature" published this week. The researchers found that placing graphene flakes in a low-temperature environment with an intensity of 35 Tesla magnetic field and 0.3 degree Celsius above absolute zero can change the conductive properties of graphene, allowing it to conduct electrons in the direction of electron spins. Filtration, which is currently not possible with any conventional electronic system. Under typical conditions, graphene appears as a normal conductor, to which a voltage is applied and current passes. However, if a piece of graphene is placed in a magnetic field perpendicular to it, the properties of the graphene will change - the current will only run along the edge of the graphene sheet, and the other part will become an insulator. In addition, the current at this time will only advance 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 in the above situation, adding a strong magnetic field level with the placement of graphene, the characteristics of graphene will change again: the electrons can still only run along the edge of the graphene, but run The direction from unidirectional to bidirectional, and the specific direction is determined by the different directions of electron spin. The author of the paper, Andrey Yang, a postdoctoral fellow at the Massachusetts Institute of Technology, said: “We have created an extraordinary special conductor. Separation of electrons based on the direction of electron spin is a common feature of topological insulators. Graphene is not a topological insulator in the usual sense.We have achieved the same effect in different material systems.More importantly, by changing the magnetic field, we can also control the direction of electronic operation and the state of power on or off at any time. This means that they can be used to make circuits and transistors, which have not been implemented before." Pablo Galloi-Herello, an associate professor at the Massachusetts Institute of Technology, said that this feature of graphene had been previously predicted but no one has ever implemented it. This study confirms for the first time that monolithic graphene is selective for spintronics; it also demonstrates for the first time that graphene can control the direction in which electrons run, whether they are energized or not. This experiment completed the work that some researchers have been trying to achieve without success for decades, and is expected to produce a new method of manufacturing quantum computers. Ray Elshory, a professor of physics at the Massachusetts Institute of Technology who participated in the study, said that this research has drawn new directions for the study of topological insulators. He said: "We cannot predict what the findings will lead to, but it broadens our thinking and offers possibilities for the manufacture of multiple devices." Andre Yang said: Because of the extreme low temperature and magnetic environment, it is not easy to achieve such a requirement. Therefore, the quantum computer manufactured using this technology will be a very professional device and may be used first for high Priority calculation tasks. In the next step, they will test the performance of graphene at lower magnetic fields (1 Tesla) and at higher temperatures in order to reduce the threshold for the use of this technology. (Wang Xiaolong) Saw Blade,Reciprocating Saw,Scroll Saw,Coping Saw Ningbo Hoya Electronic Commerce Co., LTD , https://www.jauhitools.com