Dissipation in a topological Josephson junction

Paul Matthews; Pedro Ribeiro; Antonio M. García-García

doi:10.1103/physrevlett.112.247001

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arXiv · 1311.5842

Dissipation in a topological Josephson junction

Paul Matthews·Pedro Ribeiro·Antonio M. García-García

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Abstract

Topological features of low dimensional superconductors have caused a lot of excitement recently because of their broad range of applications in quantum information and their potential to reveal novel phases of quantum matter. A potential problem for practical applications is the presence of phase-slips that break phase coherence. Dissipation in non-topological superconductors suppresses phase-slips and can restore long-range order. Here we investigate the role of dissipation in a topological Josephson junction. We show that the combined effects of topology and dissipation keeps phase and anti-phase slips strongly correlated so that the device is superconducting even under conditions where a non-topological device would be resistive. The resistive transition occurs at a critical value of the dissipation which is four times smaller than that expected for a conventional Josephson junction. We propose that this difference could be employed as a robust experimental signature of topological superconductivity.

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Paul Matthews, Pedro Ribeiro, Antonio M. García-García. 2013-11-22. Dissipation in a topological Josephson junction. https://doi.org/10.1103/physrevlett.112.247001

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