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Control of Andreev Bound States Using Superconducting Phase Texture.

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Researchers observed Andreev bound states in superconductor-semiconductor-superconductor Josephson junctions. Phase textures in leads control these states, offering a method to manipulate Andreev states in planar junctions.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Superconductivity

Background:

  • Superconductor-semiconductor-superconductor (S-S) structures are crucial for studying quantum phenomena.
  • Andreev bound states (ABS) are key to understanding transport in Josephson junctions.
  • Controlling ABS localization is essential for quantum device applications.

Purpose of the Study:

  • To investigate the behavior of Andreev bound states in a planar Josephson junction under a magnetic field.
  • To explore the influence of superconducting lead phase textures on ABS.
  • To demonstrate a method for controlling ABS position and size.

Main Methods:

  • Fabrication of a superconductor-semiconductor-superconductor planar Josephson junction.
  • Local and nonlocal tunneling spectroscopy measurements.
  • Application of a perpendicular magnetic field.
  • Comparison with a theoretical model.

Main Results:

  • Observation of Andreev bound states with opposite phase-inversion asymmetries in local spectra.
  • Phase symmetry in nonlocal spectra.
  • Agreement between experimental spectral signatures and theoretical predictions.
  • Identification of phase textures in superconducting leads as the controlling factor for ABS localization.

Conclusions:

  • Superconducting lead phase textures effectively localize and control the position of Andreev bound states.
  • This provides a straightforward method for manipulating Andreev states within planar junctions.
  • The findings contribute to the understanding and control of quantum states in Josephson junctions.