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A Kamlapure1, L Cornils2, J Wiebe2

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Researchers engineered magnetic atom chains on superconductors to control Yu-Shiba-Rusinov states. This advances the design of topological superconductors and Majorana modes for quantum computing applications.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Surface Science

Background:

  • Magnetic atoms on superconductors create Yu-Shiba-Rusinov (YSR) states within the superconducting energy gap.
  • Spin chains of magnetic adatoms on s-wave superconductors can lead to topological superconductivity and Majorana modes.

Purpose of the Study:

  • To demonstrate the engineering of YSR states' energy levels.
  • To establish a prototype platform for controlling magnetic interactions in atom chains on superconductors.
  • To advance the design and manipulation of Majorana end states for quantum computation.

Main Methods:

  • Utilizing a scanning tunneling microscope (STM) tip.
  • Placing interstitial iron (Fe) atoms near adsorbed Fe atoms on an oxidized tantalum (Ta) surface.
  • Engineering the proximity and interaction between adatoms and interstitial atoms.

Main Results:

  • Demonstrated control over YSR state energy levels by strategic placement of interstitial Fe atoms.
  • Showed that linking adsorbed Fe atoms with interstitial ones strengthens interactions within a long spin chain.
  • Established a method for manipulating magnetic interactions crucial for topological superconductivity.

Conclusions:

  • The study presents a novel method for engineering YSR states and magnetic interactions on superconducting surfaces.
  • This work is a significant step towards the controlled assembly and manipulation of spin chains for topological quantum computation.
  • The developed platform facilitates the precise control of Majorana end states, essential for future quantum technologies.