Umklapp scattering in superlattices found to degrade high-temperature mobility of graphene's charge carriers

phys.org | 10/25/2018 | Staff
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A team of researchers from the U.K., Japan and the U.S. has found that Umklapp scattering in moiré superlattices can degrade the intrinsic high-temperature mobility of its graphene's charge carriers. In their paper published in the journal Nature Physics, the group describes their study of superlattices made with graphene and using hexagonal boron nitride as a substrate, and what they found.

A superlattice is a structure made by layering two or more very thin materials together—it is typically on the order of a few nanometers, and usually made at least partially with graphene. As scientists look for ways to continue shrinking down the materials and structures used to make devices such as smartphones and laptops, they have looked to structures like nanoscale atom cluster arrays based on quantum dot superlattices. Notably, it has been observed that an optimal design for a superlattice follows a moiré pattern (based on the textile). But such ideas may have to be modified due to the findings by the researchers on this new effort. In their work, they have found that Umklapp electron-electron (Uee) scattering degrades the mobility...
(Excerpt) Read more at: phys.org
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