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Active Metamaterials with Negative Static Electric Susceptibility.

Flynn Castles1,2, Julian A J Fells3, Dmitry Isakov1,4

  • 1Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK.

Advanced Materials (Deerfield Beach, Fla.)
|January 28, 2020
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate negative static electric susceptibility (χ(0) < 0) in active metamaterials, overcoming previous theoretical and experimental limitations. This breakthrough enables new applications like stable electrostatic levitation.

Keywords:
active materialselectrostaticsmetamaterials

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Area of Science:

  • Metamaterials
  • Electromagnetism
  • Condensed Matter Physics

Background:

  • Textbook physics dictates positive static electric susceptibility (χ(0) > 0).
  • Previous theoretical predictions for negative susceptibility (χ(0) < 0) required non-equilibrium conditions (low temperature, pressure, and laser pumping).
  • Experimental confirmation of negative susceptibility has been elusive.

Purpose of the Study:

  • To experimentally achieve and confirm negative static electric susceptibility (χ(0) < 0) in a novel system.
  • To explore active metamaterials as a platform for realizing this elusive property.
  • To investigate the potential technological applications of negative electric susceptibility.

Main Methods:

  • Design and fabrication of active metamaterial structures with internal power sources.
  • Experimental characterization of the fabricated metamaterials at room temperature and pressure.
  • Tuning of the metamaterial properties to achieve negative susceptibility values.

Main Results:

  • Demonstrated tunable negative static electric susceptibility (χ(0) < 0) in active metamaterials.
  • Achieved susceptibility values over a thousand times greater than previously predicted.
  • Experimental evidence supports the concept of active metamaterials for realizing negative susceptibility.

Conclusions:

  • Active metamaterials provide a viable pathway to achieving negative static electric susceptibility under ambient conditions.
  • This work experimentally validates a long-sought property, the electric analog of diamagnetism.
  • The findings open possibilities for advanced technologies, including stable electrostatic levitation.