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Tunable Terahertz Plasmons in Graphite Thin Films.

Qiaoxia Xing1,2, Chaoyu Song1,2, Chong Wang1,2

  • 1State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China.

Physical Review Letters
|April 23, 2021
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Summary
This summary is machine-generated.

Strong terahertz plasmons were achieved in graphite thin films, offering significant tunability via temperature or electrical bias. This research explores two-component plasmas for advanced terahertz modulation technologies.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Photonics

Background:

  • Tunable terahertz plasmons are crucial for reconfigurable photonics.
  • Graphene exhibits weak terahertz plasmon responses, limiting applications.

Purpose of the Study:

  • To demonstrate strong and tunable terahertz plasmons in graphite thin films.
  • To investigate the contributions of different charge carriers to plasmon response.

Main Methods:

  • Infrared spectroscopy was employed to study terahertz plasmons.
  • Magnetoplasmon studies were conducted to analyze charge carrier dynamics.
  • In situ bias voltage and temperature variations were used to tune plasmon response.

Main Results:

  • Strong terahertz plasmons were observed in graphite thin films.
  • Significant tunability was achieved through moderate temperature changes and in situ bias voltage.
  • Both massive electrons and massless Dirac holes were found to contribute comparably to the plasmon response.

Conclusions:

  • Graphite thin films provide a robust platform for strong and tunable terahertz plasmons.
  • The findings open avenues for terahertz modulation using electrical bias or all-optical methods.
  • This work facilitates further exploration of two-component plasmas.