Observation of intercalation-driven zone folding in quasi-free-standing graphene energy bands
Journal Article
·
· Physical Review B
- Columbia Univ., New York, NY (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
Two-photon photoemission measurements reveal a near-zero-dispersion empty electronic state, approximately 2.6 eV above the Fermi energy and near the Brillouin zone center, induced by oxygen intercalation at the graphene-Ir(111) interface. While oxygen intercalation leads to quasi-freestanding graphene, electron diffraction shows 2 x 2 periodicity due to the patterned intercalant. Near the zone center, large-wavevector zone folding, driven by this 2 x 2 periodicity, replicates states from near the Dirac cone that have little dispersion due to trigonal warping, explaining the nearly at band. The zone-folding mechanism is supported by results from angle-resolved photoemission measurements and from density-functional-theory-based calculations of the unfolded energy bands. These results demonstrate zone-folding effects in graphene on a wavevector and energy scale that has largely been unexplored and may open new opportunities to engineer the graphene electronic states.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- FG02-90ER14104; SC0012704
- OSTI ID:
- 1492771
- Alternate ID(s):
- OSTI ID: 1688506
OSTI ID: 1491768
- Report Number(s):
- BNL--210915-2019-JAAM
- Journal Information:
- Physical Review B, Journal Name: Physical Review B Journal Issue: 3 Vol. 99; ISSN 2469-9950; ISSN PRBMDO
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Efficient green emission from edge states in graphene perforated by nitrogen plasma treatment
|
journal | July 2019 |
| Efficient Green Emission from Edge States in Graphene Perforated by Nitrogen Plasma Treatment | text | January 2019 |
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