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The Diffusion of Passive Tracers in Laminar Shear Flow
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Local noise in a diffusive conductor.

E S Tikhonov1,2, D V Shovkun1,2, D Ercolani3

  • 1Moscow Institute of Physics and Technology, Dolgoprudny, 141700, Russia.

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|July 29, 2016
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Summary

Researchers developed a miniature noise probe to measure local noise temperature in current-biased conductors. This overcomes current conservation limitations, enabling non-invasive measurements in non-equilibrium electronic systems.

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Area of Science:

  • Condensed Matter Physics
  • Nanoscale Science
  • Quantum Electronics

Background:

  • Local control and measurement of non-equilibrium states are crucial for energy harvesting, thermoelectrics, and nano-electronic heat management.
  • Existing local probes include tunnel junctions and Raman thermography, but measuring noise locally is constrained by current conservation.

Purpose of the Study:

  • To demonstrate a method for measuring the local noise temperature of a current-biased diffusive conductor.
  • To overcome the fundamental constraint of current conservation that typically makes noise a property of the entire conductor.

Main Methods:

  • Utilized a miniature noise probe to interact with a current-biased diffusive conductor.
  • Developed an approach to circumvent the limitations imposed by current conservation.

Main Results:

  • Successfully measured the local noise temperature of the conductor.
  • The developed method is virtually non-invasive to electronic energy distributions.

Conclusions:

  • The miniature noise probe effectively measures local noise temperature in non-equilibrium regimes.
  • This technique extends local measurement capabilities into strongly non-equilibrium electronic systems.