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Area of Science:

  • Condensed matter physics
  • Materials science
  • Ultrafast spectroscopy

Background:

  • Dynamic control of material properties via vibrational excitation is a key goal.
  • Metal-to-insulator transitions are often driven by few structural modes, making them suitable for selective control.
  • Understanding non-equilibrium pathways is crucial for targeted phase navigation.

Purpose of the Study:

  • To demonstrate mode-selective control over the metal-to-insulator phase transition in indium atomic wires.
  • To investigate the role of coherent inertial motion in the transition state.
  • To steer collective atomic motion using tailored ultrafast laser pulses.

Main Methods:

  • Ultrafast low-energy electron diffraction (ULEED) for monitoring the phase transition.
  • Tailored pulse sequences to selectively enhance or suppress phonon modes.
  • Ab initio molecular dynamics simulations to analyze atomic motion.

Main Results:

  • Achieved mode-selective control over the metal-to-insulator transition in In/Si(111).
  • Demonstrated steering of collective atomic motion by manipulating phonon modes.
  • Simulations revealed ballistic structural transitions along Peierls amplitude mode deformation vectors.

Conclusions:

  • Coherent excitation of collective modes via exciton-phonon interactions can bypass entropic barriers.
  • This approach enables dynamic control of material functionality.
  • Highlights the potential for vibrational control in advanced materials.