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arXiv · 2407.16535

Microwave Signatures of Topological Superconductivity in Planar Josephson Junctions

Barış Pekerten·David Brandão·Bassel Heiba Elfeky·Tong Zhou·Jong E. Han·Javad Shabani·Igor Žutić
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Abstract

Planar Josephson junctions provide a platform to host topological superconductivity which, through manipulating Majorana bound states (MBS), could enable fault-tolerant quantum computing. However, what constitutes experimental signatures of topological superconductivity and how MBS can be detected remains strongly debated. In addition to spurious effects that mimic MBS, there is a challenge to discern the inherent topological signals in realistic systems with many topologically-trivial Andreev bound states, determining the transport properties of Josephson junctions. Guided by the advances in microwave spectroscopy, we theoretically study Al/InAs-based planar Josephson junction embedded into a radio-frequency superconducting quantum interference device to identify microwave signatures of topological superconductivity. Remarkably, by exploring the closing and reopening of a topological gap, we show that even in a wide planar Josephson junction with many Andreev bound states, such a topological signature is distinguishable in the resonance frequency shift of a microwave drive and the ``half-slope'' feature of the microwave absorption spectrum. Our findings provide an important step towards experimental detection of non-Abelian statistics and implementing scalable topological quantum computing.

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Barış Pekerten, David Brandão, Bassel Heiba Elfeky, Tong Zhou, Jong E. Han, Javad Shabani, Igor Žutić. 2024-07-23. Microwave Signatures of Topological Superconductivity in Planar Josephson Junctions. https://doi.org/10.1103/physrevb.110.l060513

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