Evolution of electronic structure on Transition Metal doped Titanium Disulfide by angle-resolved photoemission spectroscopy study

TL;DR

This study uses angle-resolved photoemission spectroscopy to analyze how transition metal intercalation, specifically Fe, alters the electronic structure of titanium disulfide, revealing charge transfer and hybridization effects.

Contribution

It provides detailed insights into the electronic band modifications and hybridization phenomena in Fe-intercalated TiS₂, a novel investigation of its kind.

Findings

Charge transfer from Fe to TiS₂ layers affects electron pockets.

Hybridized states observed near 500 meV and Fermi level.

Intercalation modifies energy bands and density of states.

Abstract

We have systematically investigated the structural property and electrical structures of the transition metal intercalated titanium disulfide compound Fe$_x$TiS$_2$ ($0\leq x\leq0.33$) from angle-resolved photoelectron spectroscopy with tunable polarized synchrotron radiation. The effect of intercalation on the energy bands and density of states of the host material around two high-symmetry points ($\Gamma, L$) is studied. Charge transfer from the Fe atoms to the dichalcogenide layers leads to the movement of the Ti 3d-derived electron pocket. Two hybridized states are observed around $\sim500$ meV and Fermi level. Knowledge of hybridization among the Fe $3d$, Ti $3d$, and S $3p$ states is very important to understand the physical of Fe$_x$TiS$_2$ system.