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Majorana edge states enable unconventional Kondo physics

Published on:

8 February 2024

Primary Category:

Strongly Correlated Electrons

Paper Authors:

Steffen Bollmann,

Jukka I. Väyrynen,

Elio J. König

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Key Details

Studies mesoscopic islands of time-reversal invariant topological superconductors

Derives an unconventional Kondo effect when islands have odd electron number

Shows anisotropies are irrelevant for the minimal case, enabling exact solution

Finds exotic thermodynamic and transport signatures, with both Fermi liquid and non-Fermi liquid behavior

Demonstrates residual ground state entropy of ln(2) protected by spin rotation symmetry

AI generated summary

Majorana edge states enable unconventional Kondo physics

This paper investigates mesoscopic islands of time-reversal invariant topological superconductors, focusing on the case when strong order parameter fluctuations are present along with Majorana edge states. When such an island has an odd number of electrons, an exotic Kondo effect emerges upon coupling it to external leads, with the leads interacting with both the Majorana degrees of freedom and the island's overall spin. For a minimal case with just two Majorana edge state pairs, anisotropies are shown to be irrelevant, permitting an exact solution that reveals unusual thermodynamic and transport signatures, including both Fermi liquid and non-Fermi liquid behavior. A key finding is the residual ground state entropy of ln(2) protected by spin rotation symmetry.

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