Active Metamaterials with Negative Static Electric Susceptibility

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.