AI Article Synopsis
- The presence of impurities in graphene significantly affects its transport properties by inducing scattering processes, particularly creating a hexagonal superlattice at specific temperatures.
- Using angle-resolved photoemission spectroscopy (ARPES), researchers found that both monolayer and bilayer graphene exhibit elastic intervalley scattering that results in new Dirac cones forming at low temperatures (below 34 K).
- The findings also reveal that impurities break sublattice symmetry and modulate the behavior of Dirac electrons, as seen through temperature-dependent measurements that show changes in quantum interference patterns.
Article Abstract
The scattering process induced by impurities in graphene plays a key role in transport properties. Especially, the disorder impurities can drive the ordered state with a hexagonal superlattice on graphene by electron-mediated interaction at a transition temperature. Using angle-resolved photoemission spectroscopy (ARPES), we reveal that the epitaxial monolayer and bilayer graphene with various impurities display global elastic intervalley scattering and quantum interference below the critical temperature (34 K), which leads to a set of new folded Dirac cones at the Brillouin-zone center by mixing two inequivalent Dirac cones. The Dirac electrons generated from intervalley scattering without chirality can be due to the breaking of the sublattice symmetry. In addition, the temperature-dependent ARPES measurements indicate the thermal damping of quantum interference patterns from Dirac electron scattering on impurities. Our results demonstrate that the electron scattering and interference induced by impurities can completely modulate the Dirac bands of graphene.
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| http://dx.doi.org/10.1021/acs.nanolett.1c02714 | DOI Listing |
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