Synthesis and Characterizations of Novel 2D and Topological Materials v.Lina Liu, AU Physics

Two-dimensional (2D) materials exhibit numerous remarkable properties and promising applications in future (opto) electronics as well as great potential in quantum computing. In spite of the extensively studied groups of 2D materials like graphene and other hexagonal phases, a variety of novel-phase-2D materials has also been predicted. In today’s talk, we present our innovative synthesis strategies for three unconventional 2D materials: pentagonal PdTe₂, PtBi₂ and 1T’ MoS₂. Through epitaxial growth, we achieve high-quality thin films and characterize their intrinsic atomic configurations and electronic structures using scanning tunneling microscopy and various spectroscopic methods. Properties such as band dispersions, edge states and superconductivity are discussed. In the end, we demonstrate transistors fabricated by novel heterophase 2D MoS₂ and their reduced Schottky barriers, giving rise to a promising way to reduce contact resistance and thus enhance transport performance in future devices.