Molecular beam epitaxy growth and scanning tunneling microscopy study of TiSe${}_2$ ultrathin films

Abstract

Molecular beam epitaxy is used to grow TiSe2 ultrathin films on graphitized SiC(0001) substrate. TiSe2films proceed via a nearly layer-by-layer growth mode and exhibit two dominant types of defects, identified as Se vacancy and interstitial, respectively. By means of scanning tunneling microscopy, we demonstrate that the well-established charge density waves can survive in single unit-cell (one triple layer) regime, and find a gradual reduction in their correlation length as the density of surface defects in TiSe2 ultrathin films increases. Our findings offer important insights into the nature of charge density wave in TiSe2, and also pave a material foundation for potential applications based on the collective electronic states.

arXiv comment5 pages, 4 figures

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Cited by in corpus (24)

• Characterization of collective ground states in single-layer NbSe2
• Identifying substitutional oxygen as a prolific point defect in monolayer transition metal dichalcogenides with experiment and theory
• Observation of charge density wave order in 1D mirror twin boundaries of single-layer MoSe2
• Large spin-orbit splitting of deep in-gap defect states of engineered sulfur vacancies in monolayer WS2
• Point Defects and Grain Boundaries in Rotationally Commensurate MoS2 on Epitaxial Graphene
• Ultrafast charge ordering by self-amplified exciton-phonon dynamics in TiSe${}_2$
• Stable charge density wave phase in a 1T-TiSe${}_2$ monolayer
• Exciton-phonon cooperative mechanism of the triple-$q$ charge-density-wave and antiferroelectric electron polarization in TiSe${}_2$
• Refractive uses of layered and two-dimensional materials for integrated photonics
• Semiconductor-metal phase transition and emergent charge density waves in 1T-ZrX${}_2$ (X = Se, Te) at the two-dimensional limit
• Correlation between crystal purity and the charge density wave in 1$T$-VSe${}_2$
• First-principles study of superconductivity in 2D and 3D forms of PbTiSe${}_2$: Suppressed charge density wave in 1\emph{T}-TiSe${}_2$
• Quasiparticle energy bands and Fermi surfaces of monolayer NbSe${}_2$
• Charge Density Wave Hampers Exciton Condensation in 1T-TiSe${}_2$
• Nontrivial doping evolution of electronic properties in Ising-superconducting alloys
• Raman spectroscopy of optical phonon and incommensurate charge density wave modes in 2H-TaSe2 exfoliated flakes
• Electron correlations rule the phonon-driven instability in single layer TiSe${}_2$
• Charge density waves and Fermi level pinning in monolayer and bilayer SnSe${}_2$
• Vibrational and dielectric properties of monolayer transition metal dichalcogenides
• First-principles investigation of low-dimension MSe${}_2$ (M = Ti, Hf, Zr) configurations as promising thermoelectric materials
• Self-assembled nano-columns in Bi2Se3 grown by molecular beam epitaxy
• Topological theory of inversion-breaking charge-density-wave monolayer 1\textit{T}-TiSe${}_2$
• Chiral charge density wave and backscattering-immune orbital texture in monolayer 1T-TiTe2
• Substrate pre-sputtering for layer-by-layer van der Waals epitaxy of 2D materials