Scientists from the University of Wollongong (UOW), working together with colleagues in China’s Beihang University, Nankai University, and Institute of Physics in Chinese Academy of Sciences, have successfully established an atomic scale, two-way electronic kagome lattice with possible applications in electronics and quantum computing systems.
The study paper is printed in the November problem of Science Advances.
A kagome lattice is called after a classic Japanese woven bamboo pattern made up of interlaced triangles and hexagons.
The study team made the kagome lattice by layering and twisting two nanosheets of silicene. Silicene is a silicon-based, one-atom thick, Dirac fermion substance using a hexagonal honeycomb construction, which electrons can rate across at near the speed of light.
When silicene is twisted into a kagome lattice, however, electrons become”trapped”, circling round from the hexagons of this lattice.
Dr. Yi Du, that directs the Scanning Tunneling Microscopy (STM) team at UOW’s Institute for Superconducting and Electronic Materials (ISEM) and Beihang-UOW Joint Research Centre, is the newspaper’s corresponding author.
He said scientists have been interested in producing a 2-D kagome lattice due to the useful theoretical digital properties this type of construction could have.
“Theorists predicted quite a while ago that in the event that you put electrons in a digital kagome lattice, damaging interferences would signify that the electrons, rather than flowing would rather turn around into a vortex and could eventually become locked from the lattice. It’s equal to somebody losing their way into a maze rather than getting out,” Dr. Du explained.
“The interesting point is that the electrons are going to be liberated only when the lattice is broken, when you produce an advantage. Once an edge forms, electrons will move along with it with no electrical resistance–it has very low immunity, therefore quite low energy and electrons may move very quickly, at the speed of light. This is of fantastic significance for designing and growing low-energy-cost devices.
“Meanwhile, using a powerful so-called spin-orbital coupling impact, novel quantum phenomena, like frictional quantum Hall effect, are anticipated to take place at room temperature. This may pave a means for quantum devices later on.”
Though the theoretical properties of a digital kagome lattice created it of fantastic interest to scientists, making such a substance has proved extremely hard.
“For it to function as called, you need to be certain that the lattice is continuous, which spans of the lattice are similar to the wavelengths of the electron, which rules a whole lot of stuff out,” Dr. Du explained.
“It needs to be a sort of substance where the electron can just proceed on the surface. And you need to find something that’s conductive, and has quite a powerful spin-orbital coupling effect.
“There aren’t a lot of elements on the planet which have these properties”
1 component that really does is silicene. Dr. Du and his colleagues made their 2-D digital kagome lattice by twisting together two layers of silicene. In a turning angle of 21.8 levels they shaped a kagome lattice.
When the researchers put electrons to it, then it acted as predicted.
“We observed all of the quantum phenomena called in our synthetic kagome lattice at silicene,” Dr. Du explained.
The anticipated advantages of this breakthrough will probably be considerably more energy efficient digital apparatus and quicker, more powerful computers.