Observation of intercalation-driven zone folding in quasi-free-standing graphene energy bands

Lin, Yi; Chen, Ge; Sadowski, Jerzy T.; Li, Yunzhe; Tenney, Samuel A.; Dadap, Jerry I.; Hybertsen, Mark S.; Osgood, Richard M.

doi:10.1103/PhysRevB.99.035428

Title: Observation of intercalation-driven zone folding in quasi-free-standing graphene energy bands

Journal Article · 22 January 2019 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.99.035428 · OSTI ID:1492771

Lin, Yi ^[1]; Chen, Ge ^[1]; Sadowski, Jerzy T. ^[2]; Li, Yunzhe ^[1]; Tenney, Samuel A. ^[2]; Dadap, Jerry I. ^[1]; Hybertsen, Mark S. ^[2]; Osgood, Richard M. ^[1]

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.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0012704

OSTI ID:: 1492771

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

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