Physical Properties of Novel 2D Semimetal WTe_2: From Microscopic Study to Devices

摘要

An increasing number of alternative two-dimensional (2D) materials are being explored in the "post-graphene age", such as transition metal dichalcogenides (TMDs), silicene, and germanene. In this study, multiple measurements, including scanning tunneling microscopy (STM), electrical transport and Raman spectroscopy are performed on freshly cleaved surfaces of semimetallic tungsten ditelluride (WTe_2) crystals. High sample quality with very low density of defects is confirmed by STM observation. Furthermore, we investigate Raman spectroscopy of thin-layer WTe_2. Our results reveal that few-layer WTe_2 could be an ideal candidate for future 2D electronic, optoelectronic devices.