Angle-resolved photoemission spectroscopic studies on two-dimensional materials

The electronic structure of a material is the key factor to determine its electronic, magnetic, and optical properties. As an advanced technique to directly observe the electronic structure, angle-resolved photoemission spectroscopy (ARPES) has been widely used for studying the fundamental physical and chemical properties of a material. In recent years, enormous two-dimensional (2D) materials with outstanding performances have been continually discovered, promising for future applications in optoelectronic, electronic, and spintronic devices. In this review article, we briefly introduce the basic components and principles of an ARPES system, and review the frontier progress of the ARPES studies on the electronic structures and fundamental physical properties of 2D materials. The 2D materials reviewed in this article can be categorized in four parts: graphene, h-BN, single element 2D materials, transition metal dichalcogenides (TMDCs). Among them, the ARPES results on graphene are the most fruitful, and have stimulated the expanding researches on the other 2D materials. In present, the studies on 2D van der Waals heterostructures have attracted great attention. We also include some ARPES studies on 2D stacking heterostructures.