Browsing by Author "Marchenko, D."
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- ItemLifshitz transition in titanium carbide driven by a graphene overlayer(College Park, MD : APS, 2023) Krivenkov, M.; Marchenko, D.; Golias, E.; Sajedi, M.; Frolov, A.S.; Sánchez-Barriga, J.; Fedorov, A.; Yashina, L.V.; Rader, O.; Varykhalov, A.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.
- ItemOn the possibility of PhotoEmission Electron Microscopy for E. coli advanced studies(Amsterdam [u.a.] : Elsevier, 2020) Turishchev, S.Yu.; Marchenko, D.; Sivakov, V.; Belikov, E.A.; Chuvenkova, O.A.; Parinova, E.V.; Koyuda, D.A.; Chumakov, R.G.; Lebedev, A.M.; Kulikova, T.V.; Berezhnoy, A.A.; Valiakhmedova, I.V.; Praslova, N.V.; Preobrazhenskaya, E.V.; Antipov, S.S.The novel approach was proposed for detailed high-resolution studies of morphology and physico-chemical properties concomitantly at one measurement spot of E. coli bacterial cells culture immobilized onto silicon wafer surface in UHV conditions applying PhotoEmission Electron Microscopy under Hg lamp irradiation. For the E. coli characterization scanning electron microscopy (electron beam) and X-ray photoelectron spectroscopy (X-ray tube radiation) were applied prior to PhotoEmission Electron Microscopy measurements. In spite of irradiation doses collected for the cell arrays we were successful in detection of high-resolution images even of single E. coli bacterium by PhotoEmission Electron Microscopy technique followed by detailed high-resolution morphology studies by scanning electron microscopy. These results revealed widespread stability of the E. coli membranes shape after the significant number of applied characterization techniques. © 2019 The Authors