The physics of stacked graphene layers is both rich and unpredictable

When two layers of graphene are stacked, even the tiniest misalignment can slow electrons down or bring them to a halt altogether. The underlying physics is particularly rich, with the graphene behaving like a superconductor or, conversely, like an insulator!
A recent Irig meta-analysis of around ten studies shed new light on these phenomena. The researchers pointed out that the high variability in behavior from one two-layer stack to another is not only due to differences in alignment.
It can also be attributed to fabrication-process-induced deformations and residual strain in the layers. A relative stretch of just 1% can dramatically alter the layers’ electronic properties.
The research was published in Physical Review Letters.

Read the abstract: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.127.126405

Contact: vincent.renard@cea.fr

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