Surface State Transport in 3D Topological Insulators

In this talk, I will discuss transport measurements of the topological surface state of the 3D TI Bi₂Se₃. By carefully configuring devices and controlling doping levels, we are able to demonstrate the unique properties of surface transport. In particular, we show that the supercurrent flows primarily through surface states in TI-superconductor junctions, that there is ballistic surface transport in nanowires exhibiting Aharonov-Bohm effects, and that finite momentum shifts of Cooper pairs is evident in superconducting junctions studied via Fraunhofer spectroscopy.