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Intense terahertz pulses can induce local polar structures in KTaO3, but do not create a global ferroelectric phase. The observed long-lived relaxation in terahertz-driven second harmonic generation is due to defect-induced dipolar correlations.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science
  • Nonlinear Optics

Background:

  • Light-induced ferroelectricity offers dynamic control over hidden orders in quantum materials.
  • Quantum paraelectrics, like KTaO3, are candidates for exploring light-induced phase transitions.
  • Terahertz (THz) excitation is a promising tool for manipulating soft modes in these materials.

Purpose of the Study:

  • To investigate the possibility of inducing a transient ferroelectric phase in KTaO3 using intense THz excitation.
  • To understand the mechanism behind the observed long-lived relaxation in THz-driven second harmonic generation (SHG) signals.
  • To determine if global ferroelectricity can be achieved in KTaO3 via THz pulses.

Main Methods:

  • Intense THz pulses were used to excite the soft mode in KTaO3 at 10 K.
  • THz-driven second harmonic generation (SHG) was measured to probe the material's response.
  • Coherent soft-mode oscillations were analyzed to understand the excitation dynamics.

Main Results:

  • A long-lived relaxation (up to 20 ps) was observed in the THz-driven SHG signal.
  • Intense THz pulses (up to 500 kV/cm) did not induce a global ferroelectric phase in KTaO3.
  • The relaxation was attributed to THz-driven moderate dipolar correlations between defect-induced local polar structures, not a global phase transition.

Conclusions:

  • Intense THz fields can induce local polar correlations in KTaO3, but not a macroscopic ferroelectric state.
  • The findings clarify the origin of long-lived relaxation phenomena in THz-excited quantum paraelectrics.
  • This work impacts the understanding of light-induced phase control in quantum materials.