Ground state topology of a four-terminal superconducting double quantum dot

Abstract

In recent years, various classes of systems were proposed to realize topological states of matter. One of them are multiterminal Josephson junctions where topological Andreev bound states are constructed in the synthetic space of superconducting phases. Crucially, the topology in these systems results in a quantized transconductance between two of its terminals comparable to the quantum Hall effect. In this work, we study a double quantum dot with four superconducting terminals and show that it has an experimentally accessible topological regime in which the non-trivial topology can be measured. We also include Coulomb repulsion between electrons which is usually present in experiments and show how the topological region can be maximized in parameter space.

18 pages, 9 figures, submitted to SciPost Physics

References in corpus (12)

• Topological Photonics
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• Topological Andreev bands in three-terminal Josephson junctions
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• Multi-terminal Josephson junctions: a road to topological flux networks
• Non-Abelian monopoles in the multiterminal Josephson effect
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Cited by in corpus (7)

• Surrogate model solver for impurity-induced superconducting subgap states
• Non-hermitian topology in multiterminal superconducting junctions
• Quantum circuits with multiterminal Josephson-Andreev junctions
• Cooper quartets in interacting hybrid superconducting systems
• Quartet Tomography in Multiterminal Josephson Junctions
• Exploring the energy spectrum of a four-terminal Josephson junction: Towards topological Andreev band structures
• Multiterminal Josephson junctions with tunable topological properties