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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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High-TcCooper-pair injection in a semiconductor-superconductor structure.

Shlomi Bouscher1, Zhixin Kang2, Krishna Balasubramanian1

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We observed Andreev reflection in YBCO-GaN junctions, a key step for high-temperature superconductor/semiconductor devices. This demonstrates superconducting proximity, enabling new optoelectronics and quantum optics research.

Keywords:
Andreev reflectionhigh-Tc superconductivitysuperconductor–semiconductor

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Optics

Background:

  • Superconducting proximity effects are crucial for advanced electronic devices.
  • High-temperature superconductors (HTS) offer unique advantages for integration with semiconductors.
  • Demonstrating Andreev reflection in HTS/semiconductor junctions is a significant challenge.

Purpose of the Study:

  • To investigate Andreev reflection in Yttrium Barium Copper Oxide (YBCO)/Gallium Nitride (GaN) junctions.
  • To assess the feasibility of superconducting proximity in HTS/semiconductor heterostructures.
  • To explore potential applications in novel optoelectronics and quantum optics.

Main Methods:

  • Differential conductance spectroscopy was employed to probe the YBCO-GaN junction.
  • Experimental data was compared with a theoretical model for validation.
  • Measurements were conducted up to the critical temperature of the superconductor.

Main Results:

  • A distinct zero-bias peak, characteristic of Andreev reflection, was observed.
  • This peak persisted up to the critical temperature, indicating robust superconducting properties.
  • A small superconducting order parameter (Δ ∼ 1 meV) was determined for the junction.

Conclusions:

  • The study successfully demonstrated Andreev reflection in a YBCO-GaN junction.
  • This finding represents a milestone towards realizing superconducting proximity in HTS/semiconductor systems.
  • Efficient Cooper pair injection opens possibilities for advanced optoelectronic and quantum optical applications.