Spectroscopic evidence of highly correlated electrons in VSe2

We present detailed high-resolution angle-resolved photoemission experiments on VSe2 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 +/- 5 K while the Fermi gap persists up to similar to 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.

Automated summary

We conducted detailed high-resolution angle-resolved photoemission experiments on VSe2 samples grown under different conditions. The results showed that optimally grown samples exhibited high-temperature spectral kink, quasiparticle peak, and the Fermi gap in their surface electronic structure. These findings suggest strong electronic correlation, often associated with superconducting behavior. Furthermore, the temperature evolution of the quasiparticle peak and the Fermi gap followed a trend similar to that observed in high-temperature superconductors. These realizations can guide future studies in inducing high-temperature superconductivity in transition metal dichalcogenides and understanding the physics behind high-Tc superconductors.