Anisotropic electronic structure of antimonene

Abstract

Antimonene is a recently discovered two-dimensional semiconductor with high carrier mobility, suitable bandgap, and strong spin-orbit coupling, which is of great interest for future electronic, optoelectronic, and spintronics device applications. However, as the basic properties of materials, the electronic structure of antimonene is not fully understood. In this work, the whole and anisotropic electronic structures of antimonene modulated by a horizontal crystal field have been studied in detail by angle-resolved photoemission spectroscopy. The valence band of antimonene for semiconductor properties is characterized by a three-dimensional anisotropic "M"-shape with hexagonal deformation in (E, kx, ky) space. Moreover, the surface state of antimonene for metallic properties is characterized by an upward conelike structure with a stronger warping effect. The anisotropic electronic structure of antimonene is systematically depicted along the high symmetric direction and constant energy contours.