Ion Cosma Fulga (26.02, 13:15)
Affiliation: IFW DresdenFW Dresden, Germany Title: Electrically-switchable second order topological superconductor Abstract:Second order topological superconductors (SOTSC) have a gapped D-dimensional bulk, gapped boundaries, but host protected modes on (D-2)-dimensional regions of the boundary, such as the corners or hinges of a system. Motivated by recent advances in Majorana nanowire experiments, we propose to realize a tunable SOTSC as a two-dimensional nanowire array. We show that the coupling between the Majorana modes of adjacent wires can be controlled by current-biasing the device, allowing to access a variety of topological phases. We characterize the system using scattering theory, which provides access to its transport properties and its topological invariants. Further, we show that the setup is robust against disorder, and that the latter can drive the system from a trivial to a topological phase.