Topological Larkin-Ovchinnikov phase and Majorana zero mode chain in bilayer superconducting topological insulator films
  We theoretically study bilayer superconducting topological insulator film, in
which superconductivity exists for both top and bottom surface states. We show
that an in-plane magnetic field can drive the system into Larkin-Ovchinnikov
(LO) phase, where electrons are paired with finite momenta. The LO phase is
topologically non-trivial and characterized by a Z 2 topological invariant,
leading to a Majorana zero mode chain along the edge perpendicular to in-plane
magnetic fields.
