Silicon-based electronics are approaching their physical limitations and new materials are needed to keep up with current technological demands. Two-dimensional (2D) materials have a rich array of properties, including superconductivity and magnetism, and are promising candidates for use in electronic systems, such as transistors.
Silicon-based electronics are approaching their physical limitations and new materials are needed to keep up with current technological demands. Two-dimensional materials have a rich array of properties, including superconductivity and magnetism, and are promising candidates for use in electronic systems, such as transistors. However, precisely controlling the properties of these materials is extraordinarily difficult.
This research, led by materials science & engineering professor Pinshane Huang and postdoctoral researcher Yichao Zhang, was recently published in the journal"How the interfaces of the bilayer align with each other and through what mechanism they transform into a different configuration is very important," Zhang says."It controls the properties of the entire bilayer system which, in turn, affects both its nanoscale and microscopic behavior.
While researchers have speculated that this may happen, there hasn't been any direct visualization at the atomic scale proving or disproving the theory. Zhang and the other researchers, however, were able to directly track the movement of individual atoms to see the tiny, aligned domain grow. They also observed that aligned regions could form at relatively low temperatures, ~200°C, in the range of typical processing temperatures for 2D devices.
Understanding how rearrangement happens can help tune the interfacial alignment at the nanoscale."It is impossible to underscore how excited people are about that tuneability," Huang says."The macroscopic twist between the two layers is a really important parameter because as you rotate one on the other, you can actually change the properties of the entire system. For example, if you rotate the 2D material graphene to a specific angle, it becomes superconducting.
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