Topological Majorana Two-Channel Kondo Effect

TL;DR

This paper explores a topologically protected two-channel Kondo effect in a one-dimensional topological superconductor hosting Majorana Kramers pairs, revealing universal transport phenomena without fine-tuning.

Contribution

It demonstrates the realization of a topologically protected, channel-symmetric two-channel Kondo effect in a superconductor with Majorana Kramers pairs, without the need for fine-tuning.

Findings

Topologically protected two-channel Kondo effect observed

Universal transport controlled by a lead at one end

Nonlocal teleportation effects vanish

Abstract

A one-dimensional time-reversal-invariant topological superconductor hosts a Majorana Kramers pair at each end, where time-reversal symmetry acts as a supersymmetry that flips local fermion parity. We examine the transport anomaly of such a superconductor, floating and tunnel-coupled to normal leads at its two ends. We demonstrate the realization of a topologically-protected, channel-symmetric, two-channel Kondo effect without fine-tuning. Whereas the nonlocal teleportation vanishes, a lead present at one end telecontrols the universal transport through the other end.