The researchers proposed bilayer graphene (MATBG) as a potential superconductor.MATBG has two
Superconductors are materials that conductelectrical current with virtually no electrical resistance. This ability makes them extremely interesting and attractive for a variety of applications, such as power cables, electric motors and generators, as well as powerful electromagnets that can be used for MRI imaging and magnetic levitation trains.
An angle of 1.1° leads to a violation of the rotationalsymmetries, instead a high-order symmetry is formed - SU (4). When the temperature changes, fluctuations begin in the system, similar to ripples on water, only they occur in the atomic structure. Fluctuations lead to a sharp change in the electronic structure and symmetry breaking. This rotational symmetry breaking is also called the nematic state and is closely related to the superconducting properties of other materials.
In their work, Professor Kontani and Dr. Onari use theoretical methods to better understand how the source of this nematic state works in MATBG.
We know that high-temperature superconductivity can occur due to nematic fluctuations in highly correlated electronic systems.If we figure out the mechanism and origin of this nematic order, we can develop superconductors with higher temperatures.
Seiichiro Onari from the Department of Physics, Nagoya University
The temperature of the superconducting junction of twisted two-layer graphene is very low and is-272 °C. But with the help of the nematic state, it can be increased by a few degrees.The results show that MATBG behaves like a high-temperature iron-based superconductor, but it also hasFor example, the total current of the charge loop causes a magnetic field in the polarized state of the valley, while the current of the loop is compensated by each valley in the nematic state.
In addition, the plasticity of graphene can also be used to expand the practical applications of these superconductors.
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