Topological superconductivity and Majorana bound states at the LaAlO$_3$/SrTiO$_3$ interface

N. Mohanta; A. Taraphder

doi:10.1209/0295-5075/108/60001

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arXiv · 1312.7779

Topological superconductivity and Majorana bound states at the LaAlO$_3$/SrTiO$_3$ interface

N. Mohanta·A. Taraphder

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Abstract

The interface between two band insulators LaAlO$_3$ and SrTiO$_3$ 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.

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N. Mohanta, A. Taraphder. 2014-12-31. Topological superconductivity and Majorana bound states at the LaAlO$_3$/SrTiO$_3$ interface. https://doi.org/10.1209/0295-5075%2F108%2F60001

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