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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Domain wall in a chiral p-wave superconductor: a pathway for electrical current.

I Serban¹, B Béri, A R Akhmerov

¹Instituut-Lorentz, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands.

Physical Review Letters

|May 21, 2010

Summary

Topological superconductors with chiral p-wave symmetry exhibit unique domain wall properties. A novel method detects these states by observing a one-way electrical charge channel at domain boundaries, overcoming previous detection challenges.

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Area of Science:

Condensed Matter Physics
Materials Science
Quantum Phenomena

Background:

Superconductors with p(x) +/- ip(y) pairing symmetry possess chiral edge states.
Detecting these chiral edge states is challenging due to the Meissner effect and the nature of Majorana fermion edge excitations.
Existing methods are hindered by equilibrium screening and the inability of Majorana fermions to transport charge near the Fermi level.

Purpose of the Study:

To demonstrate a novel method for detecting topological superconductors with chiral p-wave symmetry.
To overcome the limitations of equilibrium detection and Majorana fermion charge transport.
To identify a unique signature of these topological superconductors.

Main Methods:

Investigated the boundary between p(x)+ip(y) and p(x)-ip(y) superconducting domains.
Derived a product rule for domain wall conductance.
Utilized the derived rule to cancel the effect of a tunnel barrier between electrodes and the superconductor.

Main Results:

The boundary between different chiral p-wave domains forms a one-way channel for electrical charge.
The derived product rule for domain wall conductance enables effective cancellation of tunnel barrier effects.
This provides a distinct signature for identifying topological superconductors in the chiral p-wave symmetry class.

Conclusions:

The study successfully identified a new, detectable signature for topological superconductors.
The developed method offers a unique way to probe chiral p-wave superconductors.
This finding advances the characterization and potential applications of topological superconducting materials.