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Origin of the π -band replicas in the electronic structure of graphene grown on 4H -SiC(0001)

Polley, C. M. LU ; Johansson, L. I.; Fedderwitz, H. LU ; Balasubramanian, T. LU ; Leandersson, M. LU ; Adell, J. LU ; Yakimova, R. and Jacobi, C. (2019) In Physical Review B 99(11).
Abstract

The calculated electronic band structure of graphene is relatively simple, with a Fermi surface consisting only of six Dirac cones in the first Brillouin zone - one at each K̄. In contrast, angle-resolved photoemission measurements of graphene grown on SiC(0001) often show six satellite Dirac cones surrounding each primary Dirac cone. Recent studies have reported two further Dirac cones along the Γ-K̄ line, and argue that these are not photoelectron diffraction artifacts but real bands deriving from a modulation of the ionic potential in the graphene layer. Here we present measurements using linearly polarized synchrotron light which show all of these replicas as well as several additional ones. Using information obtained from dark... (More)

The calculated electronic band structure of graphene is relatively simple, with a Fermi surface consisting only of six Dirac cones in the first Brillouin zone - one at each K̄. In contrast, angle-resolved photoemission measurements of graphene grown on SiC(0001) often show six satellite Dirac cones surrounding each primary Dirac cone. Recent studies have reported two further Dirac cones along the Γ-K̄ line, and argue that these are not photoelectron diffraction artifacts but real bands deriving from a modulation of the ionic potential in the graphene layer. Here we present measurements using linearly polarized synchrotron light which show all of these replicas as well as several additional ones. Using information obtained from dark corridor orientations and angular warping, we demonstrate that all but one of these additional features - including those previously assigned as real initial-state bands - are possible to explain by simple final-state photoelectron diffraction.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
99
issue
11
publisher
American Physical Society
external identifiers
  • scopus:85062706057
ISSN
2469-9950
DOI
10.1103/PhysRevB.99.115404
language
English
LU publication?
yes
id
8ff06d85-1726-48e5-9a7a-187847961e83
date added to LUP
2019-03-19 13:04:43
date last changed
2019-04-23 04:47:02
@article{8ff06d85-1726-48e5-9a7a-187847961e83,
  abstract     = {<p>The calculated electronic band structure of graphene is relatively simple, with a Fermi surface consisting only of six Dirac cones in the first Brillouin zone - one at each K̄. In contrast, angle-resolved photoemission measurements of graphene grown on SiC(0001) often show six satellite Dirac cones surrounding each primary Dirac cone. Recent studies have reported two further Dirac cones along the Γ-K̄ line, and argue that these are not photoelectron diffraction artifacts but real bands deriving from a modulation of the ionic potential in the graphene layer. Here we present measurements using linearly polarized synchrotron light which show all of these replicas as well as several additional ones. Using information obtained from dark corridor orientations and angular warping, we demonstrate that all but one of these additional features - including those previously assigned as real initial-state bands - are possible to explain by simple final-state photoelectron diffraction.</p>},
  articleno    = {115404},
  author       = {Polley, C. M. and Johansson, L. I. and Fedderwitz, H. and Balasubramanian, T. and Leandersson, M. and Adell, J. and Yakimova, R. and Jacobi, C.},
  issn         = {2469-9950},
  language     = {eng},
  number       = {11},
  publisher    = {American Physical Society},
  series       = {Physical Review B},
  title        = {Origin of the π -band replicas in the electronic structure of graphene grown on 4H -SiC(0001)},
  url          = {http://dx.doi.org/10.1103/PhysRevB.99.115404},
  volume       = {99},
  year         = {2019},
}