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Light-Matter Interaction in Ultrastable Tunneling Nanogaps.

Yuankai Tang1, Saurav Prakash2, Proloy Nandi2

  • 1Department of Physics, Emory University, Atlanta, Georgia 30322, United States.

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|July 23, 2025
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Summary
This summary is machine-generated.

Researchers developed ultrastable tunneling junctions for studying light-matter interactions. These junctions enable reliable investigation of photon-assisted transport, revealing optical rectification as a key mechanism.

Keywords:
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Area of Science:

  • Nanoscale science
  • Quantum optics
  • Materials science

Background:

  • Tunnel junctions are promising for nanoscale light-matter interactions like electroluminescence and photoassisted transport.
  • Controlling these interactions is difficult due to poorly understood mechanisms and unstable junctions.
  • Forming stable, reliable junctions is a major challenge in tunneling research.

Purpose of the Study:

  • To fabricate ultrastable tunneling junctions for reliable investigation of photon-assisted transport.
  • To understand the underlying mechanisms of laser-induced current in tunneling junctions.
  • To explore the potential of these junctions for future nanoscale optoelectronic applications.

Main Methods:

  • Fabrication of ultrastable tunneling junctions using epitaxial indium-tin-oxide, lutetium oxide, and gold.
  • Investigation of photon-assisted transport phenomena using direct-current detection.
  • Analysis of laser-induced current contributions, including optical rectification, thermal effects, and hot-electron currents.

Main Results:

  • Demonstrated ultrastable tunneling junctions with consistent tunneling currents.
  • Identified optical rectification as the primary contributor to laser-induced current.
  • Observed significant thermal effects and hot-electron currents alongside optical rectification.

Conclusions:

  • The developed ultrastable tunneling junctions provide a reliable platform for studying nanoscale light-matter interactions.
  • Optical rectification is a dominant mechanism in laser-induced current within these junctions.
  • The epitaxial nature and high breakdown threshold of these junctions offer potential for nanoscale light sources and photodetectors.