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Fabrication and Characterization of Superconducting Resonators

Fabrication and Characterization of Superconducting Resonators

Published on: May 21, 2016

Fermi-Liquid Approach for Superconducting Kondo Problems.

Alex Zazunov¹, Stephan Plugge¹, Reinhold Egger¹

¹Institut für Theoretische Physik, Heinrich-Heine-Universität, D-40225 Düsseldorf, Germany.

Physical Review Letters

|December 1, 2018

Summary

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We introduce a Fermi liquid theory for superconducting Kondo problems. Our findings reveal a 4π periodic Andreev spectrum in Anderson impurities between superconductors, distinct from topological Majorana junctions.

Area of Science:

Condensed Matter Physics
Quantum Phenomena
Superconductivity

Background:

Superconducting Kondo problems are complex quantum phenomena.
Understanding the interplay between Kondo effect and superconductivity is crucial.
Existing theories may not cover regimes with high Kondo temperatures relative to superconducting gaps.

Purpose of the Study:

To develop a Fermi liquid approach for superconducting Kondo problems.
To investigate the current-phase relation and Andreev level spectrum.
To analyze the behavior of Anderson impurities coupled to superconductors.

Main Methods:

Application of Fermi liquid theory.
Analysis of Anderson impurity models.
Study of systems with two s-wave superconductors.

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Main Results:

A Fermi liquid approach is presented for high Kondo temperature regimes.
A 4π periodic Andreev spectrum is found in the particle-hole symmetric Kondo limit.
Voltage bias causes asymmetric distortion of Andreev levels, differentiating the effect from Majorana junctions.

Conclusions:

The developed theory provides insights into superconducting Kondo systems.
The observed 4π periodicity and its distortion under bias are key findings.
This work distinguishes novel 4π effects from those in topological Majorana systems.