Singlet-triplet superconducting quantum magnetometer

Mohammad Alidoust; Klaus Halterman; Jacob Linder

doi:10.1103/PhysRevB.88.075435

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Singlet-triplet superconducting quantum magnetometer

Mohammad Alidoust, Klaus Halterman, Jacob Linder

DOI 10.1103/PhysRevB.88.075435 · Physical Review B

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Abstract

Motivated by the recent experimental realization of a quantum interference transistor based on the superconducting proximity effect, we here demonstrate that the inclusion of a textured ferromagnet both strongly enhances the flux sensitivity of such a device and additionally allows for singlet-triplet switching by tuning a bias voltage. This functionality makes explicit use of the induced spin-triplet correlations due to the magnetic texture. Whereas the existence of such triplet correlations is well known, our finding demonstrates how spin-triplet superconductivity may be utilized for concrete technology, namely, to improve the functionality of ultrasensitive magnetometers.