Topological superconductivity and Majorana bound states at the LaAlO3/SrTiO3 interface
1 Department of Physics, Indian Institute of Technology Kharagpur - Kharagpur, W.B. 721302, India
2 Centre for Theoretical Studies, Indian Institute of Technology Kharagpur - Kharagpur, W.B. 721302, India
Received: 27 September 2014
Accepted: 29 November 2014
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 overcome 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.
PACS: 03.65.Vf – Phases: geometric; dynamic or topological / 74.20.Rp – Pairing symmetries (other than s-wave) / 74.62.Dh – Effects of crystal defects, doping and substitution
© EPLA, 2014