Kagome van-der-Waals Pd3P2S8 with flat band

TL;DR

This paper reports a van-der-Waals kagome lattice material, Pd3P2S8, with a flat band arising from localized states, which can be exfoliated to monolayer for potential electronic control.

Contribution

It introduces Pd3P2S8 as a new 2D kagome lattice material with a flat band and demonstrates its exfoliation potential and magnetic properties.

Findings

Presence of a flat band from localized states.

Pd3P2S8 can be exfoliated to monolayer.

Diamagnetic susceptibility matches theoretical predictions.

Abstract

With the advanced investigations into low-dimensional systems, it has become essential to find materials having interesting lattices that can be exfoliated down to monolayer. One particular important structure is a kagome lattice with its potentially diverse and vibrant physics. We report a van-der-Waals kagome lattice material, Pd3P2S8, with several unique properties such as an intriguing flat band. The flat band is shown to arise from a possible compact-localized state of all five 4d orbitals of Pd. The diamagnetic susceptibility is precisely measured to support the calculated susceptibility obtained from the band structure. We further demonstrate that Pd3P2S8 can be exfoliated down to monolayer, which ultimately will allow the possible control of the localized states in this two-dimensional kagome lattice using the electric field gating.