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:
-
- 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
- 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; TRN: US2100044
- 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. https://doi.org/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. https://doi.org/10.1103/PhysRevB.100.155307. https://www.osti.gov/servlets/purl/1574018.
@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 = {Wed Oct 23 00:00:00 EDT 2019},
month = {Wed Oct 23 00:00:00 EDT 2019}
}
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Cited by: 11 works
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Figures / Tables:
Fig. 1: Diffraction pattern for mixture of buffer layer(BL) and single layer graphene (SLG) at energy E = 194 eV. The BSC forms around the (00) and G(10) but not the SiC(10) spots. Several spots are marked including the 5/13 spot and the two neighboring spots forming a 3-spot cluster.more »
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