Diffraction paradox: An unusually broad diffraction background marks high quality graphene

Chen, S.; Horn von Hoegen, M.; Thiel, P. A.; Tringides, M. C.

doi:10.1103/PhysRevB.100.155307

Title: Diffraction paradox: An unusually broad diffraction background marks high quality graphene

Journal Article · 23 October 2019 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.100.155307 · OSTI ID:1574018

Chen, S. ^[1]; Horn von Hoegen, M. ^[2]; Thiel, P. A. ^[3]; Tringides, M. C. ^[1]

Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
Univ. of Duisburg-Essen, Duisburg (Germany). Dept. of Physics, and Center for Nanointegration (CENIDE)
Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Chemistry

The realization of the unusual properties of two-dimensional (2D) materials requires the formation of large domains of single-layer thickness, extending over the mesoscale. It is found that the formation of uniform graphene on SiC, contrary to textbook diffraction, is signaled by a strong bell-shaped component (BSC) around the (00) and G(10) spots (but not around the substrate spots). The BCS is also seen on graphene grown on metals, because a single uniform graphene layer can be also grown with large lateral size. It is only seen by electron diffraction but not with x-ray or He scattering. Although the origin of such an intriguing result is unclear, its presence in the earlier literature (but never mentioned) points to its robustness and significance. A likely mechanism relates to the the spatial confinement of the graphene electrons, within a single layer. Finally, this leads to large spread in their wave vector which is transferred by electron-electron interactions to the elastically scattered electrons to generate the BSC.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-07CH11358; SFB1242

OSTI ID:: 1574018

Alternate ID(s):: OSTI ID: 1573291

Report Number(s):: IS-J 10074; PRBMDO; TRN: US2100044

Journal Information:: Physical Review B, Vol. 100, Issue 15; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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