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Tunable Spatiotemporal Orders in Driven Insulators.

Daniel Kaplan1, Pavel A Volkov2, Ahana Chakraborty1,3

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Physical Review Letters
|February 28, 2025
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Summary
This summary is machine-generated.

Driving optical phonons with THz waves can create novel nanoscale orders in materials. This spatiotemporal order, robust against temperature, offers new possibilities for tunable material properties.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Nonlinear optics

Background:

  • Optical phonons are fundamental excitations in solids.
  • Exciting phonons can modify material properties.
  • Controlling these modifications at the nanoscale is a key challenge.

Purpose of the Study:

  • To investigate the possibility of inducing spatiotemporal orders in solids by driving optical phonons.
  • To explore the characteristics and robustness of these induced orders.
  • To identify potential applications in nanoscale material control.

Main Methods:

  • Theoretical modeling of driven phonon dynamics.
  • Analysis of spatiotemporal order formation above a threshold fluence.
  • Predictions for experimental observation using time-resolved diffraction.

Main Results:

  • Driving optical phonons above a threshold fluence induces spatiotemporal orders.
  • The induced order exhibits an incommensurate wave vector (q₀) in space and half the drive frequency in time.
  • The order is robust against temperature and can include static 2q₀ modulations.

Conclusions:

  • THz-driven optical phonons offer a pathway to realize tunable incommensurate orders in solids.
  • This phenomenon opens possibilities for nanoscale control of material properties.
  • Experimental verification is predicted via time-resolved diffraction in candidate materials.