British "Nature" magazine issued two consecutive physics papers, reporting new insights from MIT scientists about the behavior of unconventional superconducting materials. This discovery has caused a stir in the industry, known as graphene super The major progress of the guide. This type of material has plagued physicists for decades and has recently discovered or contributed to the development of high-temperature superconducting materials for making powerful magnets or developing low-power electronics.
According to the superconductivity theory of 1957, some materials can conduct electricity with zero resistance. However, many materials exhibit so-called unconventional superconductivity and cannot be explained by this theory.
This time, the MIT scientist Pablo Galileo Herrera and colleagues found that when two layers of graphene are twisted together at a "magical angle", they show unconventional superconductivity. . In other words, the research team discovered a new electronic state in the two layers of graphene, which can easily achieve the transition from insulator to superconductor, and its properties are similar to high-temperature superconductivity of copper oxide (its structure is often difficult to adjust).
This "magic angle" of graphene in addition to the formation of superconductivity - from the strong attraction between the electrons to produce zero resistance, but also the formation of another electronic state. In the second paper, the team showed that a twisted double-layered graphene system will exhibit a new insulating state, the Mott Insulator, which seems to be driven by powerful electronic interactions. produce.
The systems reported in the two papers can be easily adjusted by changing the twist angle and the electric field. This means that the results will provide a new two-dimensional platform for scientists to understand the origins of high-temperature superconductivity that has long puzzled the physics community, and will open a door to study unconventional superconductors, as well as new ones. The development and engineering of electrical performance pave the way. (Reporter Zhang Mengran)
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