Double Kagome bands in a two-dimensional phosphorus carbide P2C3

TL;DR

This paper introduces a novel double Kagome band structure in a two-dimensional phosphorus carbide P2C3, enabling coexistence of Dirac and flat bands, with implications for magnetic and transport properties.

Contribution

It reports the discovery of double Kagome bands in P2C3, a new 2D material, and explores its electronic, magnetic, and potential experimental synthesis routes.

Findings

Existence of double Kagome bands in P2C3

Strong magnetism induced by hole doping

Coexistence of edge states on the Fermi level

Abstract

The interesting properties of Kagome bands, consisting of Dirac bands and a flat band, have attracted extensive attention. However, the materials with only one Kagome band around the Fermi level cannot possess physical properties of Dirac fermions and strong correlated fermions simultaneously. Here, we propose a new type of band structure --- double Kagome bands, which can realize coexistence of the two kinds of fermions. Moreover, the new band structure is found to exist in a new two-dimensional material, phosphorus carbide P2C3. The carbide material shows good stability and unusual electronic properties. Strong magnetism appears in the structure by hole doping of the flat band, which results in spin splitting of the Dirac bands. The edge states induced by Dirac and flat bands coexist on the Fermi level, indicating outstanding transport characteristics. In addition, a possible route to experimentally grow P2C3 on some suitable substrates such as the Ag (111) surface is also discussed.