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

Abstract

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.

Authors:
 [1];  [2];  [3];  [1]
  1. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
  2. Univ. of Duisburg-Essen, Duisburg (Germany). Dept. of Physics, and Center for Nanointegration (CENIDE)
  3. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Chemistry
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1574018
Alternate Identifier(s):
OSTI ID: 1573291
Report Number(s):
IS-J 10074
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
AC02-07CH11358; SFB1242
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 15; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Chen, S., Horn von Hoegen, M., Thiel, P. A., and Tringides, M. C. Diffraction paradox: An unusually broad diffraction background marks high quality graphene. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.155307.
Chen, S., Horn von Hoegen, M., Thiel, P. A., & Tringides, M. C. Diffraction paradox: An unusually broad diffraction background marks high quality graphene. United States. doi:10.1103/PhysRevB.100.155307.
Chen, S., Horn von Hoegen, M., Thiel, P. A., and Tringides, M. C. Wed . "Diffraction paradox: An unusually broad diffraction background marks high quality graphene". United States. doi:10.1103/PhysRevB.100.155307.
@article{osti_1574018,
title = {Diffraction paradox: An unusually broad diffraction background marks high quality graphene},
author = {Chen, S. and Horn von Hoegen, M. and Thiel, P. A. and Tringides, M. C.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.100.155307},
journal = {Physical Review B},
number = 15,
volume = 100,
place = {United States},
year = {2019},
month = {10}
}

Journal Article:
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