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We measured conductance in a superconductor-semiconductor device. Antisymmetric conductance components match predictions, revealing tunable Andreev bound states and aiding the search for Majorana zero modes.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Phenomena
  • Hybrid Superconducting Systems

Background:

  • Superconductor-semiconductor heterostructures are crucial for exploring topological superconductivity.
  • Understanding the transport properties of these devices is key to identifying exotic quasiparticles like Majorana zero modes.
  • Conductance measurements provide insights into the electronic structure and Andreev bound states.

Purpose of the Study:

  • To investigate the conductance properties of a three-terminal superconductor-semiconductor hybrid device.
  • To analyze the symmetry of local and nonlocal conductances and compare them with theoretical predictions.
  • To characterize the local charge nature of Andreev bound states and their tunability.
  • To explore the potential of conductance-matrix measurements in the search for Majorana zero modes.

Main Methods:

  • Fabrication of a three-terminal superconductor-semiconductor hybrid device with two normal leads and one superconducting lead.
  • Conductance-matrix measurements across different terminals of the device.
  • Symmetry decomposition of the measured conductance.
  • Analysis of conductance as a function of energy, gate voltage, and magnetic field.

Main Results:

  • Antisymmetric components of local and nonlocal conductances qualitatively match at energies below the superconducting gap.
  • The local charge character of Andreev bound states was extracted and found to be similar at both device ends.
  • Andreev bound states were shown to be tunable with gate voltage.
  • Correlated splittings in low-energy features were observed in response to a magnetic field.

Conclusions:

  • Conductance-matrix measurements offer a powerful tool to probe the electronic properties of hybrid devices.
  • The observed symmetry relations and tunable Andreev bound states provide valuable insights into the physics of these systems.
  • This technique complements traditional single-probe measurements and can aid in the ongoing search for Majorana zero modes.