Abstract
We present detailed high-resolution angle-resolved photoemission experiments on $\mathrm{V}{\mathrm{Se}}_{2}$ grown under various conditions. The surface electronic structure optimally grown samples can host high-temperature spectral kink, quasiparticle peak, and the Fermi gap. Collective observation of these electronic features refers to the strong electronic correlation and is usually attributed to the characteristics of superconductors. Temperature evolution of the quasiparticle peak and the Fermi gap also follow the trend observed in high-${T}_{c}$ superconductors as progressive quenching of the quasiparticle peak at a lower temperature than the complete Fermi gap closing. As a result, the quasiparticle peak can be observed up to 100 $\ifmmode\pm\else\textpm\fi{}$5 K while the Fermi gap persists up to $\ensuremath{\sim}$150 K. These realizations can guide future studies to induce high-temperature superconductivity in transition metal dichalcogenides as well as understand the physics behind high-${T}_{c}$ superconductors.
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