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

Abstract

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.

Authors:
 [1];  [1];  [2];  [1];  [2];  [1];  [2];  [1]
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  1. Columbia Univ., New York, NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1492771
Alternate Identifier(s):
OSTI ID: 1491768
Report Number(s):
BNL-210915-2019-JAAM
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
SC0012704; FG02-90ER14104
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 3; 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

Lin, Yi, Chen, Ge, Sadowski, Jerzy T., Li, Yunzhe, Tenney, Samuel A., Dadap, Jerry I., Hybertsen, Mark S., and Osgood, Richard M. Observation of intercalation-driven zone folding in quasi-free-standing graphene energy bands. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.035428.
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Lin, Yi, Chen, Ge, Sadowski, Jerzy T., Li, Yunzhe, Tenney, Samuel A., Dadap, Jerry I., Hybertsen, Mark S., & Osgood, Richard M. Observation of intercalation-driven zone folding in quasi-free-standing graphene energy bands. United States. doi:10.1103/PhysRevB.99.035428.
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Lin, Yi, Chen, Ge, Sadowski, Jerzy T., Li, Yunzhe, Tenney, Samuel A., Dadap, Jerry I., Hybertsen, Mark S., and Osgood, Richard M. Tue . "Observation of intercalation-driven zone folding in quasi-free-standing graphene energy bands". United States. doi:10.1103/PhysRevB.99.035428.
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@article{osti_1492771,
title = {Observation of intercalation-driven zone folding in quasi-free-standing graphene energy bands},
author = {Lin, Yi and Chen, Ge and Sadowski, Jerzy T. and Li, Yunzhe and Tenney, Samuel A. and Dadap, Jerry I. and Hybertsen, Mark S. and Osgood, Richard M.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.99.035428},
journal = {Physical Review B},
number = 3,
volume = 99,
place = {United States},
year = {2019},
month = {1}
}
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Journal Article:
Free Publicly Available Full Text
This content will become publicly available on January 22, 2020
Publisher's Version of Record
DOI:  10.1103/PhysRevB.99.035428
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