Electronic structure of monolayer <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>CrTe</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:math> : An antiferromagnetic two-dimensional van der Waals material

Magnetic van der Waals materials are an important building block to realize spintronic functionalities in heterostructures of two-dimensional (2D) materials. However, establishing their magnetic and electronic properties and the interrelationship between the magnetic ground state and electronic structure is often challenging because only a limited number of techniques can probe magnetism and electronic structure on length scales of tens to hundreds of nanometers. Chromium chalcogenides are a class of 2D magnetic materials for which a rich interplay between structure and magnetism has been predicted. Here, we combine angle-resolved photoemission and quasiparticle interference imaging to establish the electronic structure of a monolayer of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"> <a:msub> <a:mi>CrTe</a:mi> <a:mn>2</a:mn> </a:msub> </a:math> on graphite. From a comparison of model calculations with spectroscopic mapping using angle-resolved photoemission spectroscopy and scanning tunneling microscopy we establish the magnetic ground state and the low-energy electronic structure. We demonstrate that the band structure of monolayer <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"> <b:msub> <b:mi>CrTe</b:mi> <b:mn>2</b:mn> </b:msub> </b:math> is captured well by density functional theory (DFT) in a <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"> <c:mrow> <c:mi>DFT</c:mi> <c:mo>+</c:mo> <c:mi>U</c:mi> </c:mrow> </c:math> framework when a Coulomb repulsion of <d:math xmlns:d="http://www.w3.org/1998/Math/MathML"> <d:mrow> <d:mi>U</d:mi> <d:mo>=</d:mo> <d:mn>2.5</d:mn> <d:mspace width="0.28em"/> <d:mi>eV</d:mi> </d:mrow> </d:math> is accounted for.