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Title: Excitation and characterization of image potential state electrons on quasi-free-standing graphene

Abstract

We investigate the band structure of image potential states in quasi-free-standing graphene (QFG) monolayer islands using angle-resolved two-photon-photoemission spectroscopy. Direct probing by low-energy electron diffraction shows that QFG is formed following oxygen intercalation into the graphene-Ir(111) interface. Despite the apparent decoupling of the monolayer graphene from the Ir substrate, we find that the binding energy of the n = 1 image potential state on these QFG islands increases by 0.17 eV, as compared to the original Gr/Ir(111) interface. We use calculations based on density-functional theory to construct an empirical, one-dimensional potential that quantitatively reproduces the image potential state binding energy and links the changes in the interface structure to the shift in energy. Specifically, two factors contribute comparably to this energy shift: a deeper potential well arising from the presence of intercalated oxygen adatoms and a wider potential well associated with the increase in the graphene-Ir distance. While image potential states have not been observed previously on QFG by photoemission, our paper now demonstrates that they may be strongly excited in a well-defined QFG system produced by oxygen intercalation. Finally, this opens an opportunity for studying the surface electron dynamics in QFG systems, beyond those found in typical nonintercalated graphene-on-substratemore » systems.« less

Authors:
 [1];  [1];  [2];  [1];  [1];  [2];  [1]
  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:
1433982
Alternate Identifier(s):
OSTI ID: 1432421
Report Number(s):
BNL-203522-2018-JAAM
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1802384
Grant/Contract Number:  
SC0012704; FG02-90ER14104
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 16; 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, Li, Yunzhe, Sadowski, Jerzy T., Jin, Wencan, Dadap, Jerry I., Hybertsen, Mark S., and Osgood, Richard M. Excitation and characterization of image potential state electrons on quasi-free-standing graphene. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.97.165413.
Lin, Yi, Li, Yunzhe, Sadowski, Jerzy T., Jin, Wencan, Dadap, Jerry I., Hybertsen, Mark S., & Osgood, Richard M. Excitation and characterization of image potential state electrons on quasi-free-standing graphene. United States. doi:10.1103/PhysRevB.97.165413.
Lin, Yi, Li, Yunzhe, Sadowski, Jerzy T., Jin, Wencan, Dadap, Jerry I., Hybertsen, Mark S., and Osgood, Richard M. Mon . "Excitation and characterization of image potential state electrons on quasi-free-standing graphene". United States. doi:10.1103/PhysRevB.97.165413. https://www.osti.gov/servlets/purl/1433982.
@article{osti_1433982,
title = {Excitation and characterization of image potential state electrons on quasi-free-standing graphene},
author = {Lin, Yi and Li, Yunzhe and Sadowski, Jerzy T. and Jin, Wencan and Dadap, Jerry I. and Hybertsen, Mark S. and Osgood, Richard M.},
abstractNote = {We investigate the band structure of image potential states in quasi-free-standing graphene (QFG) monolayer islands using angle-resolved two-photon-photoemission spectroscopy. Direct probing by low-energy electron diffraction shows that QFG is formed following oxygen intercalation into the graphene-Ir(111) interface. Despite the apparent decoupling of the monolayer graphene from the Ir substrate, we find that the binding energy of the n = 1 image potential state on these QFG islands increases by 0.17 eV, as compared to the original Gr/Ir(111) interface. We use calculations based on density-functional theory to construct an empirical, one-dimensional potential that quantitatively reproduces the image potential state binding energy and links the changes in the interface structure to the shift in energy. Specifically, two factors contribute comparably to this energy shift: a deeper potential well arising from the presence of intercalated oxygen adatoms and a wider potential well associated with the increase in the graphene-Ir distance. While image potential states have not been observed previously on QFG by photoemission, our paper now demonstrates that they may be strongly excited in a well-defined QFG system produced by oxygen intercalation. Finally, this opens an opportunity for studying the surface electron dynamics in QFG systems, beyond those found in typical nonintercalated graphene-on-substrate systems.},
doi = {10.1103/PhysRevB.97.165413},
journal = {Physical Review B},
number = 16,
volume = 97,
place = {United States},
year = {2018},
month = {4}
}

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Figures / Tables:

FIG. 1 FIG. 1: µ-LEED patterns of (a) cleaned Ir(111), (b) preintercalated Gr/Ir, (c) oxygen-intercalated Gr/O/Ir and (d) oxygen-deintercalated Gr/Ir. The energy label on the top right corner of each subfigure denotes the incident electron kinetic energy. The arrows in (c) indicate the hexagonal diffraction patterns associated with graphene and iridium surfaces.

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.