Lifshitz transition in titanium carbide driven by a graphene overlayer
(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.
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- author
- Krivenkov, M. ; Marchenko, D. ; Golias, E. LU ; Sajedi, M. ; Frolov, A. S. ; Sánchez-Barriga, J. ; Fedorov, A. ; Yashina, L. V. ; Rader, O. and Varykhalov, A.
- organization
- publishing date
- 2023-04
- 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}}, }