Unconventional Superconductivity in Double Quantum Dots

Abstract

The formation of electron pairs is a prerequisite of superconductivity. The fermionic nature of electrons yields four classes of superconducting correlations with definite symmetry in spin, space and time. Here, we suggest double quantum dots coupled to conventional s-wave superconductors in the presence of inhomogeneous magnetic fields as a model system exhibiting unconventional pairing. Due to their small number of degrees of freedom, tunable by gate voltages, quantum-dot systems provide an ideal tool to gain fundamental insight in unconventional pairing. We propose two detection schemes for unconventional superconductivity, based on either Josephson or Andreev spectroscopy.

5 pages manuscript + 5 pages supplemental material

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Cited by in corpus (48)

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• Exceptional odd-frequency pairing in non-Hermitian superconducting systems
• The Majorana STM as a perfect detector of odd-frequency superconductivity
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• Spin correlation and entanglement detection in Cooper pair splitters by current measurements using magnetic detectors
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• Dia- and paramagnetic Meissner effect from odd-frequency pairing in multi-orbital superconductors
• Current cross-correlations and waiting time distributions in Andreev transport through Cooper pair splitters based on triple quantum dots
• Fractional Josephson effect versus fractional charge in superconducting-normal metal hybrid circuits
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