Scanning tunneling microscopy and spectroscopy imaging of a kagome metal ScV₆Sn₆

Kagome metals are an exciting platform to realize novel exotic phenomena, such as dispersionless “flat” bands, Dirac and Weyl fermions, and various density waves. Recently synthesized family of kagome metals ReV₆Sn₆ comprised of a non-magnetic V kagome net offers the possibility to tune magnetism and emergent electronic states by the choice of the rare-earth Re element. In this talk, I will discuss our experiments on cleaved bulk single crystals of kagome metal ScV₆Sn₆, the first material in this family to exhibit a bulk charge density wave. We use low-temperature spectroscopic-imaging scanning tunneling microscopy (SI-STM) to investigate its surface structure and its low-energy electronic properties. From quasi-particle interference imaging, we reveal a Dirac cone dispersion near Fermi level. We further explore the existence of the charge density wave at the surface and the effect of magnetic field on the electronic band structure.