Optimizing the Majorana character of SQUIDs with topologically non-trivial barriers

TL;DR

This paper models SQUIDs with topologically non-trivial barriers, demonstrating how to optimize parameters to significantly enhance Majorana fermion detection signals, and shows trivial SQUIDs can also host Majorana signatures, aiding experimental verification.

Contribution

It introduces an optimization framework for SQUID parameters to boost Majorana fermion detection and reveals that trivial SQUIDs can exhibit Majorana signatures, expanding experimental possibilities.

Findings

SQUID parameters beta_L and beta_C can increase Majorana tunneling detection by over 100 times

Trivial SQUIDs can still show strong Majorana signatures

Optimization enhances prospects for experimental verification of Majorana fermions

Abstract

We have modeled SQUIDs with topologically non-trivial superconducting junctions and performed an optimization study on the Majorana fermion detection. We find that the SQUID parameters beta_L, and beta_C can be used to increase the ratio of Majorana tunneling to standard Cooper pair tunneling by more than two orders of magnitude. Most importantly, we show that dc SQUIDs including topologically trivial components can still host strong signatures of the Majorana fermion. This paves the way towards the experimental verification of the theoretically predicted Majorana fermion.