Strongly interacting Majorana modes in an array of Josephson junctions
  An array of superconducting islands with semiconducting nanowires in the right regime provides a macroscopic implementation of Kitaev's toy model for Majorana wires. We show that a capacitive coupling between adjacent islands leads to an effective interaction between the Majorana modes. We demonstrate that even though strong repulsive interaction eventually drive the system into a Mott insulating state the competition between the (trivial) band-insulator and the (trivial) Mott insulator leads to an interjacent topological insulating state for arbitrary strong interactions. 
Fabian Hassler and Dirk Schuricht
cond-mat.str-el cond-mat.mes-hall cond-mat.supr-con