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Related Experiment Video

Updated: Jul 31, 2025

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Graphene metasurface hits the point.

Jiazheng Qin1, Mengjia Wang1, Cheng-Wei Qiu2

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

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|May 8, 2023
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Summary

Researchers have found a simpler way to access and control exceptional points using gated graphene. This breakthrough makes it easier to manipulate these unique points in physical systems.

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Area of Science:

  • Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Exceptional points (EPs) are unique degeneracies in non-Hermitian systems that present significant challenges in their experimental access and control.
  • Traditional methods for manipulating EPs often involve complex system designs and precise parameter tuning.

Purpose of the Study:

  • To investigate a novel and simplified method for accessing and controlling exceptional points.
  • To demonstrate the efficacy of graphene-based gating for EP manipulation.

Main Methods:

  • Utilizing a graphene material as a tunable gate in a physical system exhibiting exceptional points.
  • Applying electrical gating to modify the system's parameters and induce or control EP behavior.

Main Results:

  • Demonstrated that simple gating of graphene provides an accessible and effective means to reach and encircle exceptional points.
  • Showcased a significant reduction in the complexity required to manipulate EPs compared to existing techniques.

Conclusions:

  • Gating graphene offers a practical and versatile platform for exploring and utilizing exceptional points.
  • This approach opens new avenues for applications in sensing, topological photonics, and quantum information processing.