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Tunable Rectification of Diffusion-Wave Fields by Spatiotemporal Metamaterials.

Jiaxin Li1, Zhanxiang Zhang2, Guoqiang Xu1

  • 1Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore.

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Researchers demonstrate a novel rectification effect in diffusion-wave fields by modulating conductivity. This spatiotemporal diffusion metamaterial enables nonreciprocal charge transport and emerges a direct current component.

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Area of Science:

  • Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Diffusion processes are fundamental in science and engineering, typically obeying reciprocity in linear time-invariant media.
  • Classical wave dynamics research has explored spatiotemporal modulation for directional control in photons and plasmons.

Purpose of the Study:

  • To investigate the rectification effect on diffusion-wave fields by modulating conductivity.
  • To observe nonreciprocal charge transport and explore potential applications in diffusive fields.

Main Methods:

  • Experimental creation of a spatiotemporal diffusion metamaterial.
  • Modulation of conductivity to induce a mode transition to zero frequency.
  • Observation of emergent direct current components under specific frequency conditions.

Main Results:

  • Demonstrated a distinct rectification effect on diffusion-wave fields.
  • Observed nonreciprocal transport of charges.
  • Achieved a mode transition to zero frequency, leading to a direct current component when incident frequency is a multiple of the modulation frequency.

Conclusions:

  • The study showcases a novel method for achieving nonreciprocal charge diffusion using spatiotemporal modulation.
  • The developed diffusion metamaterial and observed effects hold potential for applications across various diffusive fields.