Identifying Non-centrosymmetric Electronic Structures of Defect in Tungsten Ditelluride

WTe₂ is a transition metal dichalcogenide with novel electronic structures. Because defects in WTe₂ can affect its properties, a precise classification of defects is required to help understand the possible influence beyond them. By using scanning tunneling microscope (STM) and density functional theory (DFT) calculation, we investigated both geometric and electronic structures of the defects in WTe_2. We revealed non-centrosymmetric electronic structures near the Te defects. Furthermore, each type of defect show unique interference patterns, significantly identifying four types of defects at both the bottom and top sides. These findings confirm that the observation of interference pattern is a feasible method to characterize the defects in layered materials.