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Topological Superconductivity and Majorana Fermions in RKKY Systems by Klinovaja, Jelena; Stano, Peter; Yazdani, Ali; Loss, Daniel is a scholarly article available to read on EtoBox.

What is Topological Superconductivity and Majorana Fermions in RKKY Systems about?

We consider quasi one-dimensional RKKY systems in proximity to an s-wave superconductor. We show that a $2k_F$-peak in the spin susceptibility of the superconductor in the one-dimensional limit supports helical order of localized magnetic moments via RKKY interaction, where $k_F$ is the Fermi wavevector. The magnetic helix is equivalent to a uniform magnetic field and very strong spin-orbit interaction (SOI) with an effective SOI length $1/2k_F$. We find the conditions to establish such a magnetic state in atomic chains and semiconducting nanowires with magnetic atoms or nuclear spins. Generically, these systems are in a topological phase with Majorana fermions. The inherent self-tuning of the helix to $2k_F$ eliminates the need to tune the chemical potential.

Author

Klinovaja, Jelena; Stano, Peter; Yazdani, Ali; Loss, Daniel

Published

2013

Language

EN