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Journal Article

Dissipation in a Simple Model of a Topological Josephson Junction


Ribeiro,  Pedro
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Matthews, P., Ribeiro, P., & García-García, A. M. (2014). Dissipation in a Simple Model of a Topological Josephson Junction. Physical Review Letters, 112(24): 247001, pp. 1-5. doi:10.1103/PhysRevLett.112.247001.

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The topological features of low-dimensional superconductors have created 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 nontopological 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 keep phase and antiphase slips strongly correlated so that the device is superconducting even under conditions where a nontopological device would be resistive. The resistive transition occurs at a critical value of the dissipation that is 4 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.