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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Topological phases in nodeless tetragonal superconductors.

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We computed the topological phase diagram for 2D tetragonal superconductors, revealing non-trivial topological features like high Chern numbers and protected edge states. These findings suggest potential applications in novel quantum materials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Chemistry

Background:

  • Two-dimensional (2D) superconductors with tetragonal symmetry are crucial for exploring novel quantum phenomena.
  • Understanding the interplay of crystal symmetry, spin-orbit coupling, and Zeeman fields is key to predicting topological properties.

Purpose of the Study:

  • To compute the topological phase diagram of 2D tetragonal superconductors.
  • To identify and characterize topological features arising from specific nodeless pairing channels.

Main Methods:

  • Theoretical computation of the topological phase diagram.
  • Analysis of pairing channels compatible with tetragonal symmetry.
  • Inclusion of Zeeman field and spin-orbit coupling effects.

Main Results:

  • Demonstration of non-trivial topological features in 2D tetragonal superconductors.
  • Observation of high Chern numbers and massive edge states.
  • Identification of zero-energy modes at high symmetry points, with topologically protected edge states.

Conclusions:

  • The studied superconductors exhibit robust topological properties.
  • The [Formula: see text] pairing symmetry is relevant to materials like intercalated cobaltates and doped graphene.
  • These findings pave the way for applications in topological quantum technologies.