Deliverable D4.2 : Josephson effect in a TI nanowire-based device

<p>DELIVERABLE D4.2:&nbsp;Josephson effect in a TI nanowire-based device</p> <p>Hybrid material systems with a conventional superconductor in proximity to a strong spin-orbit semiconductor or a Topological Insulator (TI) have recently acquired a vast interest due to their potential to host exotic phenomena. &nbsp;In a multimode hybrid TI Josephson junction with two terminal geometry, Majorana physics manifests as peculiar properties of a part of the Andreev bound states carrying the Josephson current. They give rise to an unconventional 4&pi; periodic current phase relation (CPR) coexisting with a 2&pi; periodic CPR resulting from the conventional Andreev bound states. The relative weight between the 4&pi; and 2&pi; periodic Andreev bound states increases with the transparency of the junction and, in general, by reducing the number of channels. We make use of Al-Bi₂Se₃-Al junctions fabricated using TINRs grown by physical vapor deposition. To extract the current phase relation of our TI-junction, we utilize an asymmetric dc-Superconducting Quantum Interference Device (SQUID) measurement technique.&nbsp;</p>