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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Spintronics

Background:

  • Topological quantum phases host exotic phenomena like Majorana bound states.
  • Heisenberg spin-1/2 ladders are model systems for studying quantum magnetism and topological phases.
  • Interfacial states can emerge at the boundaries between different material phases.

Purpose of the Study:

  • To investigate the formation and properties of interfacial states in coupled Heisenberg spin-1/2 ladders.
  • To explore the nature of Majorana bound states at phase interfaces.
  • To assess the stability and potential applications of these interfacial states.

Main Methods:

  • Theoretical modeling of coupled Heisenberg spin-1/2 ladders.
  • Analysis of phase diagrams and boundary phenomena.
  • Investigation of zero-energy bound states using analytical and numerical techniques.

Main Results:

  • Coupling spin ladders in distinct topological phases generates interfacial zero-energy Majorana bound states.
  • These interfacial states lack inherent topological protection, making them sensitive to local perturbations.
  • A significant degree of resilience was observed across a broad range of parameters.

Conclusions:

  • Interfacial Majorana bound states can form in coupled spin ladder systems.
  • Despite lacking topological protection, these states demonstrate practical robustness.
  • The observed resilience suggests potential utility in quantum applications and novel device concepts.