Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Lifshitz transition in titanium carbide driven by a graphene overlayer

Krivenkov, M. ; Marchenko, D. ; Golias, E. LU orcid ; Sajedi, M. ; Frolov, A. S. ; Sánchez-Barriga, J. ; Fedorov, A. ; Yashina, L. V. ; Rader, O. and Varykhalov, A. (2023) In Physical Review Research 5(2).
Abstract

Two-dimensional (2D) Dirac materials are electronically and structurally very sensitive to proximity effects. We demonstrate, however, the opposite effect: that the deposition of a monolayer 2D material could exercise a substantial influence on the substrate electronic structure. Here we investigate TiC(111) and show that a graphene overlayer produces a proximity effect, changing the Fermi surface topology of the TiC from six electron pockets to one hole pocket on the depth of several atomic layers inside the substrate. In addition, the graphene electronic structure undergoes an extreme modification as well. While the Dirac cone remains gapless, it experiences an energy shift of 1.0 eV beyond what was recently achieved for the Lifshitz... (More)

Two-dimensional (2D) Dirac materials are electronically and structurally very sensitive to proximity effects. We demonstrate, however, the opposite effect: that the deposition of a monolayer 2D material could exercise a substantial influence on the substrate electronic structure. Here we investigate TiC(111) and show that a graphene overlayer produces a proximity effect, changing the Fermi surface topology of the TiC from six electron pockets to one hole pocket on the depth of several atomic layers inside the substrate. In addition, the graphene electronic structure undergoes an extreme modification as well. While the Dirac cone remains gapless, it experiences an energy shift of 1.0 eV beyond what was recently achieved for the Lifshitz transition of overdoped graphene. Due to this shift, the antibonding π∗ band at the M¯ point becomes occupied and observable by photoemission.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Research
volume
5
issue
2
article number
023120
publisher
American Physical Society
external identifiers
  • scopus:85163384436
ISSN
2643-1564
DOI
10.1103/PhysRevResearch.5.023120
language
English
LU publication?
yes
id
8be35d7b-3e52-45a3-8706-7f7d1baca22d
date added to LUP
2023-09-19 15:05:09
date last changed
2023-09-19 15:05:09
@article{8be35d7b-3e52-45a3-8706-7f7d1baca22d,
  abstract     = {{<p>Two-dimensional (2D) Dirac materials are electronically and structurally very sensitive to proximity effects. We demonstrate, however, the opposite effect: that the deposition of a monolayer 2D material could exercise a substantial influence on the substrate electronic structure. Here we investigate TiC(111) and show that a graphene overlayer produces a proximity effect, changing the Fermi surface topology of the TiC from six electron pockets to one hole pocket on the depth of several atomic layers inside the substrate. In addition, the graphene electronic structure undergoes an extreme modification as well. While the Dirac cone remains gapless, it experiences an energy shift of 1.0 eV beyond what was recently achieved for the Lifshitz transition of overdoped graphene. Due to this shift, the antibonding π∗ band at the M¯ point becomes occupied and observable by photoemission.</p>}},
  author       = {{Krivenkov, M. and Marchenko, D. and Golias, E. and Sajedi, M. and Frolov, A. S. and Sánchez-Barriga, J. and Fedorov, A. and Yashina, L. V. and Rader, O. and Varykhalov, A.}},
  issn         = {{2643-1564}},
  language     = {{eng}},
  number       = {{2}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Research}},
  title        = {{Lifshitz transition in titanium carbide driven by a graphene overlayer}},
  url          = {{http://dx.doi.org/10.1103/PhysRevResearch.5.023120}},
  doi          = {{10.1103/PhysRevResearch.5.023120}},
  volume       = {{5}},
  year         = {{2023}},
}