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Area of Science:

  • Condensed Matter Physics
  • Spintronics
  • Materials Science

Background:

  • Developing compact terahertz (THz) frequency generators and sensors is a significant technological hurdle.
  • Noncollinear antiferromagnets (NCAFMs) are explored for their potential in THz applications.

Purpose of the Study:

  • To demonstrate voltage-controlled frequency generation in the THz regime using NCAFMs.
  • To investigate the tunability and dynamics of self-oscillations in kagome-structured NCAFMs.

Main Methods:

  • Derivation of an effective theory to model spin-orbit torques (SOTs) and auto-oscillation dynamics.
  • Analysis of reactive and dissipative SOT contributions.
  • Investigation of chirality-dependent dynamics in NCAFMs.

Main Results:

  • NCAFMs with kagome structure exhibit gapless self-oscillations.
  • Frequencies are tunable from 0 Hz to the THz range via electrically induced SOTs.
  • Chirality of the ground state critically influences excitation properties, enabling gapless oscillations in one case.

Conclusions:

  • NCAFMs provide a promising platform for creating tunable THz functional components.
  • These findings could help bridge the existing gap in THz technology.
  • The study highlights the potential of NCAFMs for next-generation electronic devices.