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Superconducting pair-breaking under intense sub-gap terahertz radiation

Journal Article


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Abstract


  • We study the effect of a strong and low frequency (ω < Δ, the superconducting gap) electrical field on a superconducting state. It is found that the superconducting gap decreases with the field intensity and wavelength. The physical mechanism for this dependence is the multiphoton absorption by a superconducting electron. By constructing the state of a superconducting electron dressed by photons, we determined the dependence of the superconducting gap on E / ω and temperature. We show that the critical temperature is determined by the parameter E / ω which is distinct from that induced by the heating effect. The result is consistent with experimental findings. This result can be applied to study terahertz nonlinear superconducting metamaterials.

Authors


  •   Tian, Jie (external author)
  •   Zuber, Jack (external author)
  •   Huang, Sunchao (external author)
  •   Chao Zhang

Publication Date


  • 2019

Citation


  • Tian, J., Zuber, J., Huang, S. & Zhang, C. (2019). Superconducting pair-breaking under intense sub-gap terahertz radiation. Applied Physics Letters, 114 (21), 212601-1-212601-5.

Scopus Eid


  • 2-s2.0-85066834939

Ro Full-text Url


  • https://ro.uow.edu.au/context/eispapers1/article/3877/type/native/viewcontent

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/2867

Start Page


  • 212601-1

End Page


  • 212601-5

Volume


  • 114

Issue


  • 21

Place Of Publication


  • United States

Abstract


  • We study the effect of a strong and low frequency (ω < Δ, the superconducting gap) electrical field on a superconducting state. It is found that the superconducting gap decreases with the field intensity and wavelength. The physical mechanism for this dependence is the multiphoton absorption by a superconducting electron. By constructing the state of a superconducting electron dressed by photons, we determined the dependence of the superconducting gap on E / ω and temperature. We show that the critical temperature is determined by the parameter E / ω which is distinct from that induced by the heating effect. The result is consistent with experimental findings. This result can be applied to study terahertz nonlinear superconducting metamaterials.

Authors


  •   Tian, Jie (external author)
  •   Zuber, Jack (external author)
  •   Huang, Sunchao (external author)
  •   Chao Zhang

Publication Date


  • 2019

Citation


  • Tian, J., Zuber, J., Huang, S. & Zhang, C. (2019). Superconducting pair-breaking under intense sub-gap terahertz radiation. Applied Physics Letters, 114 (21), 212601-1-212601-5.

Scopus Eid


  • 2-s2.0-85066834939

Ro Full-text Url


  • https://ro.uow.edu.au/context/eispapers1/article/3877/type/native/viewcontent

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/2867

Start Page


  • 212601-1

End Page


  • 212601-5

Volume


  • 114

Issue


  • 21

Place Of Publication


  • United States