The interface between two band insulators LaAlO3 and SrTiO3 exhibits low-temperature superconductivity coexisting with an in-plane ferromagnetic order. We show that topological superconductivity hosting Majorana bound states can be induced at the interface by applying a magnetic field perpendicular to the interface. We find that the dephasing effect of the in-plane magnetization on the topological superconducting state can be overcomed by tuning a gate-voltage. We analyze the vortex-core excitations showing the zero-energy Majorana bound states and the effect of non-magnetic disorder on them. Finally, we propose an experimental geometry where such topological excitations can be realized.
@article{arxiv.1312.7779,
title = {Topological superconductivity and Majorana bound states at the LaAlO$_3$/SrTiO$_3$ interface},
author = {N. Mohanta and A. Taraphder},
journal= {arXiv preprint arXiv:1312.7779},
year = {2015}
}