As a room temperature superconductor, the electronic structure in twisted bilayer graphene is helping superconductivity researchers.

“Finding a material which superconducts at room temperature would lead to a technological revolution, alleviate the energy crisis (as nowadays most energy is lost on the way from generation to usage) and boost computing performance to an entirely new level.
 
However, despite the progress made in understanding these systems, a full theoretical description is still elusive, leaving our search for room temperature superconductivity mainly serendipitous….
 
In recent decades, enormous research efforts have been expended on the exploration and explanation of high-temperature (high-Tc) superconductors, a class of materials exhibiting zero resistance at particularly high temperatures. Now a team of scientists from the United States, Germany and Japan explains in Nature how the electronic structure in twisted bilayer graphene influences the emergence of the insulating state in these systems, which is the precursor to superconductivity in high-Tc materials.
 
In a major scientific breakthrough in 2018, twisted bilayer graphene (TBLG) was shown to exhibit phases of matter akin to those of a certain class of high-Tc superconducting materials—the so-called high-Tc cuprates. This represents a novel inroad via a much cleaner and more controllable experimental setup.
 
The scientists from the Max Planck Institute for the Structure and Dynamics of Matter (MPSD), Freie Universität Berlin (both in Germany), Columbia University, the Center for Computational Quantum Physics at the Flatiron Institute (both in the U.S.) and the National Institute for Materials Science in Japan focused on the insulating state of TBLG….
 
The team’s work on the nature of the superconducting and insulating states seen in transport will allow researchers to benchmark theories and hopefully ultimately understand TBLG as a stepping stone towards a more complete description of the high-Tc cuprates. In the future, this will pave the way towards a more systematic approach of increasing superconducting temperatures in these and similar systems.”

 
Read full articleSimilarities in the insulating states of twisted bilayer graphene and cuprates

Source: Phys Org; by Max Planck Institute for the Structure and Dynamics of Matter

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