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

Lin, Yi; Li, Yunzhe; Sadowski, Jerzy T.; Jin, Wencan; Dadap, Jerry I.; Hybertsen, Mark S.; Osgood, Richard M.

doi:10.1103/PhysRevB.97.165413

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

Journal Article · 08 April 2018 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.97.165413 · OSTI ID:1433982

Lin, Yi ^[1]; Li, Yunzhe ^[1]; Sadowski, Jerzy T. ^[2]; Jin, Wencan ^[1]; 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)

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.

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

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

Grant/Contract Number:: FG02-90ER14104; SC0012704

OSTI ID:: 1433982

Report Number(s):: BNL--203522-2018-JAAM

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 16 Vol. 97; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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