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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Fano interference between collective modes in cuprate high-Tc superconductors.

Hao Chu1,2,3,4,5, Sergey Kovalev6, Zi Xiao Wang7

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Researchers discovered a new Fano resonance in cuprate high-temperature superconductors. This finding, observed in terahertz response, suggests interplay between superconducting and charge density wave fluctuations.

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Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • Cuprate high-temperature superconductors exhibit complex interactions and competing orders.
  • Understanding these interactions requires identifying experimental signatures.

Purpose of the Study:

  • To report a novel Fano resonance in the nonlinear terahertz response of cuprate high-temperature superconductors.
  • To characterize the amplitude and phase signatures of this new Fano resonance.

Main Methods:

  • Investigated nonlinear terahertz response of cuprate high-temperature superconductors.
  • Conducted extensive hole-doping and magnetic field dependent studies.

Main Results:

  • Observed and resolved both amplitude and phase signatures of a new type of Fano resonance.
  • The Fano resonance is linked to the electromagnetic driving frequency.

Conclusions:

  • The Fano resonance likely arises from the interplay between superconducting and charge density wave fluctuations.
  • Further research is needed to explore the dynamical interactions between these fluctuations.