High-quality two-dimensional electronic systems based on graphene are emerging as a frontier stage for exploring superconductivity. In the process of scientific exploration, researchers have captured the singular phenomenon of superconductivity in the corner graphene molar structure under the dual regulation of electrons and holes, which undoubtedly opens up a new horizon for superconductivity research. However, traces of superconductivity are still scarce in the field of pure crystalline graphene, and so far they have only been found in hole-doped rhombinic triplephene (RTG) and Bernal bilayer graphene (BBG) in specific stacking structures, which has stimulated a deep desire for superconductivity under a wider range of conditions.
Recently, a breakthrough study by Shanghai Jiao Tong University and Wuhan University showed that when Bernal's stacked bilayer graphene (BBG) and monolayer WSe2 were cleverly combined, the proximity effect between them was used to significantly enhance the superconductivity of BBG. This discovery not only deepens the understanding of the superconductivity mechanism of graphene-based composites, but also reveals a new strategy to manipulate superconductivity through interface engineering.
The research team skillfully used electrostatic doping technology to successfully induce superconducting states in the BBG/WSe2 composite system, both under the conditions of electron doping and hole doping, accompanied by a series of remarkable taste symmetry breaks. This series of discoveries not only enriches the physical property map of graphene and its composites, but also provides valuable experimental basis and theoretical enlightenment for the design and preparation of high-performance superconducting materials in the future. By precisely controlling the interface effect and doping state, scientists are gradually unraveling the complex physical mechanism behind the superconductivity phenomenon, and are steadily moving towards the realization of the dream of room-temperature superconductivity.
The intensity of the superconductivity phenomenon exhibits a unique tunability, which can be finely manipulated by applying an external vertical electric field. Under the electron and hole doping methods, the superconductivity exhibited by BBG reaches the impressive Berezinskii–Kosterlitz−Thouless transition temperature peaks of 210 mKlvin and 400 mKelvin, respectively, which indicate the tenacious vitality of superconductivity under extreme conditions. What is particularly striking is that the emergence of superconducting states is not accidental, and it is strictly dependent on the specific conditions under which the electron or hole wave function in the BBG approaches the WSe2 layer under the action of an applied electric field, highlighting the key role of the WSe2 layer as a "superconducting catalyst".
In the case of hole doping, the superconductivity exhibited by BBG challenges the traditional Pauli paramagnetic limit, and its properties coincide with the behavior of Ising superconductors, indicating that a new superconductivity mechanism is being uncovered. In contrast, although the proximity effect induces a significant Ising spin-orbit coupling interaction in the BBG conduction band under electron doping, its superconductivity still follows the constraints of the Pauli paramagnetic limit, which reveals the profound differences in the superconductivity mechanism under different doping methods.
This study not only reveals a rich physical picture of the BBG conduction band, but also provides a valuable insight into the mechanism of crystalline graphene superconductivity. It is like a key, opening a new door to the design and development of BBG-based superconducting devices, and heralding possible revolutionary breakthroughs in the fields of quantum computing and efficient energy transmission in the future. By continuously optimizing the electric field control strategy and material composite technology, we are expected to translate this cutting-edge research result into practical application and promote the leapfrog development of science and technology.
Source: Internet
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