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Topologically Enabled Superconductivity.

Michael A Rampp¹, Elio J König², Jörg Schmalian^1,3

¹Institute for Theory of Condensed Matter, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany.

Physical Review Letters

|August 26, 2022

Summary

Dynamical instanton events with Majorana zero modes enhance superconductivity in one-dimensional topological triplet superconductors. This topological enhancement stabilizes superconductivity and enables novel charge-2e superconductivity.

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Area of Science:

Condensed Matter Physics
Quantum Materials

Background:

Majorana zero modes are key signatures of topological superconductivity.
Understanding their role in enhancing superconductivity is crucial for quantum technologies.

Purpose of the Study:

Investigate how Majorana zero modes influence superconductivity dynamics.
Explore the emergence of novel superconducting states driven by topological phenomena.

Main Methods:

Theoretical analysis of a one-dimensional topological triplet superconductor model.
Inclusion of dynamical instanton events and their associated zero modes.
Examination of the system's action, particularly the θ term.

Main Results:

Dynamical instanton events with Majorana zero modes enhance or enable superconductivity.
A θ term in the action governs the dynamics of topological triplet superconductors.
Isotropic triplets exhibit algebraic charge-2e superconductivity, robust against fluctuations.
Anisotropic triplets show suppressed quantum phase slips and stabilized superconductivity.

Conclusions:

Topological superconductivity can be actively enhanced by Majorana zero modes.
This work reveals new pathways to engineer and stabilize exotic superconducting states.
Predictions for experimental verification of topologically enhanced superconductivity are provided.