Transition Metal Dichalcogenides Could Increase Computer Speed, Memory by a Million Times


Reading time ( words)

Transition metal dichalcogenides (TMDCs) possess optical properties that could be used to make computers run a million times faster and store information a million times more energy-efficiently, according to a study led by Georgia State University.

Computers operate on the time scale of a fraction of a nanosecond, but the researchers suggest constructing computers on the basis of TMDCs, atomically thin semiconductors, could make them run on the femtosecond time scale, a million times faster. This would also increase computer memory speed by a millionfold.

"There is nothing faster, except light," said Dr. Mark Stockman, lead author of the study and director of the Center for Nano-Optics and a Regents' Professor in the Department of Physics and Astronomy at Georgia State. "The only way to build much faster computers is to use optics, not electronics. Electronics, which is used by current computers, can't go any faster, which is why engineers have been increasing the number of processors. We propose the TMDCs to make computers a million times more efficient. This is a fundamentally different approach to information technology."

The researchers propose a theory that TMDCs have the potential to process information within a couple of femtoseconds. A femtosecond is one millionth of one billionth of a second. A TMDC has a hexagonal lattice structure that consists of a layer of transition metal atoms sandwiched between two layers of chalcogen atoms. This hexagonal structure aids in the computer processor speed and also enables more efficient information storage. The findings are published in the journal Physical Review B ("Femtosecond valley polarization and topological resonances in transition metal dichalcogenides").

The TMDCs have a number of positive qualities, including being stable, non-toxic, thin, light and mechanically strong. Examples include molybdenum disulfide (MOS2) and tungsten diselenide (WSe2). TMDCs are part of a large family called 2D materials, which is named after their extraordinary thinness of one or a few atoms. In this study, the researchers also established the optical properties of the TMDCs, which allow them to be ultrafast.

In the hexagonal lattice structure of TMDCs, electrons rotate in circles in different states, with some electrons spinning to the left and others turning to the right depending on their position on the hexagon. This motion causes a new effect that is called topological resonance. Such an effect allows one to read, write or process a bit of information in only a few femtoseconds.

There are numerous examples of TMDCs, so in the future, the researchers would like to determine the best one to use for computer technology.

Share


Suggested Items

Bridging the Bio-Electronic Divide

01/21/2016 | DARPA
A new DARPA program aims to develop an implantable neural interface able to provide unprecedented signal resolution and data-transfer bandwidth between the human brain and the digital world.

Counting Photons…How Low Can You Go?

01/18/2016 | DARPA
The process of detecting light—whether with our eyes, cameras or other devices—is at the heart of a wide range of civilian and military applications, including light or laser detection and ranging (LIDAR or LADAR), photography, astronomy, quantum information processing, medical imaging, microscopy and communications.

Advanced Airborne Networking Capabilities Sought for Hostile Environments

10/20/2015 | DARPA
DARPA solicits proposals to enable manned and unmanned air systems to rapidly, securely, and automatically share information across diverse waveforms and networks despite adversary jamming



Copyright © 2018 I-Connect007. All rights reserved.