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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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A topological superconductor tuned by electronic correlations.

Haoran Lin1, Christopher L Jacobs2, Chenhui Yan1

  • 1Pritzker School of Molecular Engineering, The University of Chicago, Chicago, IL, USA.

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|December 25, 2025
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Summary
This summary is machine-generated.

Electron-electron interactions tune topological superconductors in FeTeSe films. This discovery offers a new way to engineer topological phases for quantum computing applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Computing

Background:

  • Topological superconductors are essential for topological quantum computing.
  • A key challenge is understanding how electron-electron interactions influence these phases.

Purpose of the Study:

  • To investigate the role of electronic correlations in tuning topological superconductivity.
  • To identify experimental signatures of topological transitions in FeTeSe films.

Main Methods:

  • Growth of 10-unit-cell thick FeTeSe films on SrTiO3 substrates.
  • Experimental observation of topological transitions using surface-sensitive probes.
  • Theoretical modeling of electron-electron interactions in the FeTeSe system.

Main Results:

  • A topological transition was observed in FeTeSe films with Te content x > 0.7, indicated by a superconducting surface state.
  • A second transition occurred near the FeTe limit, suppressing superconductivity and the surface state.
  • Theory linked electron-electron interactions in the xy- band to this second topological transition.

Conclusions:

  • Many-body electronic correlations can be used to tune both topology and superconductivity.
  • This provides a pathway for engineering new topological phases in correlated materials.
  • The findings are significant for the development of topological quantum computing.