Signatures of the Higgs mode in transport through a normal-metal--superconductor junction

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2020
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Tang, Gaomin
Zülicke, Ulrich
Bruder, Christoph
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Physical Review Research. American Physical Society. 2020, 2, 022068(R). eISSN 2643-1564. Available under: doi: 10.1103/PhysRevResearch.1.033098
Zusammenfassung

A superconductor subject to electromagnetic irradiation in the terahertz range can show amplitude oscillations of its order parameter. However, coupling this so-called Higgs mode to the charge current is notoriously difficult. We propose to achieve such a coupling in a particle-hole-asymmetric configurations using a DC-voltage-biased normal-metal--superconductor tunnel junction. Using the quasiclassical Green's function formalism, we demonstrate three characteristic signatures of the Higgs mode: (i) The AC charge current exhibits a pronounced resonant behavior and is maximal when the radiation frequency coincides with the order parameter. (ii) The AC charge current amplitude exhibits a characteristic nonmonotonic behavior with increasing voltage bias. (iii) At resonance for large voltage bias, the AC current vanishes inversely proportional to the bias. These signatures provide an electric detection scheme for the Higgs mode and in more complex devices pave the way for advanced functionalities.

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530 Physik
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Higgs mode, normal-metal–superconductor junction,electromagnetic irradiation
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ISO 690TANG, Gaomin, Wolfgang BELZIG, Ulrich ZÜLICKE, Christoph BRUDER, 2020. Signatures of the Higgs mode in transport through a normal-metal--superconductor junction. In: Physical Review Research. American Physical Society. 2020, 2, 022068(R). eISSN 2643-1564. Available under: doi: 10.1103/PhysRevResearch.1.033098
BibTex
@article{Tang2020-02-29T08:01:34ZSigna-48909.2,
  year={2020},
  doi={10.1103/PhysRevResearch.1.033098},
  title={Signatures of the Higgs mode in transport through a normal-metal--superconductor junction},
  volume={2},
  journal={Physical Review Research},
  author={Tang, Gaomin and Belzig, Wolfgang and Zülicke, Ulrich and Bruder, Christoph},
  note={Article Number: 022068(R)}
}
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