Majorana-Klein hybridization in topological superconductor junctions

Understand

We present a powerful and general approach to describe the coupling of Majorana fermions to external leads, of interacting or non-interacting electrons.

• Our picture has the Klein factors of bosonization appearing as extra Majoranas hybridizing with the physical ones.
• We demonstrate the power of this approach by solving a highly nontrivial SO(M) Kondo problem arising in topological superconductors with M Majorana-lead couplings, allowing for arbitrary M and for conduction electron interactions.
• We find that these topological Kondo problems give rise to robust non-Fermi liquid behavior, even for Fermi liquid leads, and to a quantum phase transition between insulating and Kondo regimes when the leads form Luttinger liquids.