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Ultrafast X-ray diffraction reveals a photoinduced phase transition in 1T-TaS_{2}. The study tracks the rapid disappearance of the nearly commensurate charge density wave (CDW) state and the subsequent growth of the incommensurate CDW phase.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Ultrafast spectroscopy

Background:

  • Charge density waves (CDW) are prevalent in low-dimensional materials.
  • 1T-TaS_{2} exhibits complex CDW phases, including nearly commensurate (NC) and incommensurate (I) states.
  • Understanding phase transition dynamics is crucial for novel electronic applications.

Purpose of the Study:

  • To investigate the ultrafast photoinduced phase transition between NC-CDW and I-CDW states in 1T-TaS_{2}.
  • To elucidate the temporal evolution and domain dynamics of the photoinduced I-CDW phase.
  • To characterize the growth mechanism of the newly formed I-CDW domains.

Main Methods:

  • Femtosecond time-resolved X-ray diffraction.
  • Analysis of structural modulations and phase transformation kinetics.
  • Application of Lifshitz-Allen-Cahn growth law to domain coarsening dynamics.

Main Results:

  • The NC-CDW order vanishes within 400 fs upon photoexcitation.
  • The I-CDW phase nucleates and grows, completing its development by 100 ps.
  • The photoinduced I-CDW phase forms nanometric domains that coarsen according to the Lifshitz-Allen-Cahn law.

Conclusions:

  • Femtosecond X-ray diffraction provides unprecedented insight into ultrafast CDW phase transitions.
  • The photoinduced transition in 1T-TaS_{2} involves rapid structural changes and domain coarsening.
  • The observed coarsening dynamics confirm universal growth laws in nonconservative order parameter systems.