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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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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Magnet/superconductor hybrids (MSHs) are promising for topological superconductivity.
  • Previous studies focused on gapped topological superconductivity in 1D and 2D systems.
  • A gapless topological nodal-point superconductor (TNPSC) was theoretically proposed but not experimentally realized in MSHs.

Purpose of the Study:

  • To experimentally realize a TNPSC in a magnet/superconductor hybrid system.
  • To investigate the role of antiferromagnetism in creating topological superconducting states.
  • To explore novel routes for designing 2D topological quantum phases.

Main Methods:

  • Theoretical calculations to predict topological phases driven by antiferromagnetic order.
  • Experimental synthesis of antiferromagnetic monolayers on s-wave superconductors.
  • Low-temperature scanning tunneling microscopy (STM) to observe edge modes.

Main Results:

  • Discovery of a TNPSC in antiferromagnetic monolayers on an s-wave superconductor.
  • Observation of a gapless, time-reversal invariant topological superconducting state.
  • Experimental confirmation of a low-energy edge mode separating topological and trivial phases.
  • Edge mode spectral weight dependence on atomic configuration, matching theoretical predictions.

Conclusions:

  • Antiferromagnetism in combination with superconductivity is a viable route to engineer 2D topological quantum phases.
  • This work provides the first experimental realization of a TNPSC in an MSH system.
  • The findings open new avenues for exploring and utilizing topological quantum phenomena in novel material platforms.