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Area of Science:

  • Quantum materials science
  • Condensed matter physics
  • Nanotechnology

Background:

  • External fields can induce exotic properties in quantum materials via Floquet engineering.
  • Traditionally, optical lasers are used, but nonoptical drives like coherent phonons are emerging.
  • Quantum materials offer unique electronic and vibrational properties.

Purpose of the Study:

  • To demonstrate the use of coherent terahertz phonon drives in a metallic quantum nanowire.
  • To investigate the induction of a nonequilibrium electronic steady state.
  • To explore a novel method for detecting coherent phonon oscillations.

Main Methods:

  • Driving a metallic quantum nanowire with coherent terahertz phonons.
  • Utilizing the nanowire's vibrational modes as a heat bath and relaxation mechanism.
  • Measuring the induced electronic steady state and current properties.

Main Results:

  • A persistent quantized electrical current was induced in the quantum nanowire.
  • The current quantization resulted from electron-phonon coupling.
  • The system achieved a low-temperature heat bath and energy relaxation.

Conclusions:

  • Coherent phonon drives are a viable alternative to optical lasers for Floquet engineering in quantum materials.
  • This approach enables the creation of nonequilibrium states with unique electronic properties.
  • Transport measurements can serve as a high-precision tool for detecting coherent phonon oscillations.