Cooper-Pair Splitters as Circuit Elements for Realizing Topological Superconductors
Guilherme Delfino, Dmitry Green, Saulius Vaitiekėnas, Charles M. Marcus, Claudio Chamon
DOI 10.1103/3c6m-x28w · PRX Quantum
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Abstract
Advances in materials and fabrication of superconducting devices allows the exploration of novel quantum effects in synthetic superconducting systems beyond conventional Josephson-junction arrays. As an example, we introduce a new circuit element, the Y splitter, a superconducting loop with three leads and three Josephson junctions, smaller or comparable in size to the superconducting coherence length of the material. By tuning magnetic flux through an array of Y splitters, Cooper-pair transport can be made to interfere destructively, while spatially separated split Cooper pairs propagate coherently. We consider an array of Y splitters connected in a two-dimensional star [Archimedean (3,122)] geometry, deformable into the kagome lattice, and find a rich phase diagram that includes topological superconducting phases with Chern numbers ±2. Experimental realization appears feasible.
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