Multi hole bands and quasi 2-dimensionality in Cr2Ge2Te6 studied by angle-resolved photoemission spectroscopy

TL;DR

This study uses photoemission spectroscopy and calculations to reveal multiple hole bands and quasi-2D electronic behavior in Cr2Ge2Te6, highlighting its potential for electronic applications.

Contribution

It provides the first detailed experimental and theoretical analysis of the electronic structure and dimensionality of Cr2Ge2Te6, a 2D ferromagnet.

Findings

Multiple hole bands near the Fermi level.

Weak dispersion of hole bands indicating 2D character.

Potential for high electrical conductivity through chemical potential tuning.

Abstract

In the present work, we investigate the electronic structure of the two-dimensional (2D) ferromagnet Cr2Ge2Te6 by photoemission spectroscopy and ab initio calculations. Our results demonstrate the presence of multiple hole-type bands in the vicinity of the Fermi level indicating that the material can support high electrical conductivity by manipulating the chemical potential. Also, our photon energy dependent angle resolved photoemission experiment revealed that several of the hole bands exhibit weak dispersion with varied incident photon energy providing experimental signature for its two dimensionality. These findings can pave the way for further studies towards the application of Cr2Ge2Te6 in electronic devices.