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Spin-valley half-metals will find use in implantable electronics

Spin-valley half-metals will find use in implantable electronics

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Date : Sep 14, 2017 11:26 PM

Scientists has provided theoretical proof of the new class of materials existence

Physicists believe that the possibilities of electronics are almost exhausted. It would be highly challenging to continue increasing the number of transistors or microprocessor clock rate. Therefore, spintronics based on electron spins is currently being considered as an alternative.

The world scientific community has long been working in this field. However, a team of researchers from the Moscow Institute of Physics and Technology (MIPT) in collaboration with the Institute for Theoretical and Applied Electrodynamics (ITAE) of the Russian Academy of Sciences (RAS) and RIKEN (Institute for Physical and Chemical Research in Japan) have made their own discovery. They substantiated a new class of materials, on the basis of which it is possible to create spin-valley electronics, and named them spin-valley semimetals.

Researchers suppose a rise to a new direction in search for «nonmetallic» half-metals that do not contain atoms of transition metals, such as nickel, manganese, and lanthanum.

It is a successful solution for implantable devices and systems based on advanced carbon materials. The physicists propose to obtain nonmetallic semimetals from a special class of conductive materials — dielectrics with a charge or spin density wave. Two valleys in the initial system will make possible to create a spin-valley semimetal.

«In a way, our discovery proved to be a surprise even to ourselves. The physical model that, we found, has a spin-valley half-metallic phase is a classical one: It has been studied for decades. It is now up to the experimenters: There are plenty of materials adequately described by the model we dealt with. I am therefore convinced that the phase we predicted will eventually be discovered, either in a material that is available today or in one that is yet to be synthesized,» Artem Sboychakov, a senior researcher at ITAE RAS, commented on the study.

Description of the scientific work is published in Physical Review Letters.

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