"This material, although it's much diluted in terms of magnetic properties, can still behave like a magnet and conducts electricity at low temperature without energy loss," explains Associate Professor Weida Wu of Rutgers University-New Brunswick. "At least in principle, if you can make it work at a higher temperature, you can use it for electronic interconnections within silicon chips used in computers and other devices."
The team combined chromium and vanadium as magnetic elements with an insulator consisting of bismuth, antimony and tellurium. The team explains, when electrons in this special material are aligned in one direction – like a compass needle pointing north - an electric current can only flow along its edges in one direction, leading to zero energy loss. That means electricity could be conducted between transistors within silicon chips used in computers and other electronics with maximum efficiency.
Current silicon chips use primarily metal for electrical interconnections in transistors, but that leads to substantial energy loss, Assoc Prof. Wu said.
The scientists say they demonstrated the uniform alignment of spinning electrons in the special magnetic insulator - called the quantum anomalous Hall insulator. It conducts electricity without energy loss when the temperature is close to absolute zero: minus 459.67 degrees Fahrenheit.
With regards to the future, the next steps would include demonstrating the phenomenon at a much higher and more practical temperature for electronics, along with building a platform for quantum computing, the team say.
