Majorana coupling and Kondo screening of localized spins

Abstract

We perform a theoretical analysis of the fate of local magnetic moment of a quantum dot coupled to a normal metallic lead and a topological superconducting wire hosting Majorana modes at the ends. By means of simple analytical tools and numerical renormalization group calculations we show that the proximity of Majorana mode reduces the magnetic moment from $1/4$, characteristic of a free spin $1/2$, to $1/16$. The coupling to the normal lead then causes the Kondo effect, such that the magnetic moment is fully screened below the Kondo temperature. The latter is vastly increased for strong coupling to Majorana mode.

4 pages, 3 figures. Conference proceedings

References in corpus (6)

• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• The numerical renormalization group method for quantum impurity systems
• Interaction effects on a Majorana zero mode leaking into a quantum dot
• Quantum-Dot Parity Effects in Trivial and Topological Josephson Junctions
• Spin-resolved thermal signatures of Majorana-Kondo interplay in double quantum dots
• Robustness of the Kondo effect in a quantum dot coupled to Majorana zero modes

Cited by in corpus (1)

• Signatures of Kondo-Majorana interplay in ac response