Stuart Tessmer
Michigan State University, USA
Title: Scanning tunneling microscopy across a superconductor / topological insulator interface
Biography
Biography: Stuart Tessmer
Abstract
In this talk I will present scanning tunneling microscopy data of a Bi2Se3 crystal with superconducting PbBi islands deposited on the surface. Local density of states measurements show induced superconductivity in the topological surface state with a coherence length of order 540 nm. At energies above the gap the density of states exhibits oscillations due to scattering caused by a nonuniform order parameter. Strikingly, spectra taken on the superconductor side of the interface show Dirac-cone-like behavior suggesting an inverse proximity effect – that is topogical states induced onto the superconductor.