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6 October 2023 THz driven soft mode dynamics in quantum paraelectrics
Matthias C. Hoffmann
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Proceedings Volume PC12683, Terahertz Emitters, Receivers, and Applications XIV; PC126830A (2023) https://doi.org/10.1117/12.2681933
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States
Abstract
Quantum paraelectrics are materials that have a lattice structure similar to ferroelectrics and show soft mode phonon behavior. However, a macroscopic ferroelectric phase transition is inhibited by the quantum mechanical ground state energy. We use intense THz pulses to resonantly excite the soft mode in the quantum paraelectrics SrTiO3 (STO) and KTaO3 (KTO) and observe the resulting lattice dynamics using the Kerr effect, second harmonic and x-ray probe pulses while varying temperature and in-plane strain. We show that there is a strong nonlinear response of the soft mode phonon and coupling to other IR and Raman active modes. In bulk KTO there we observe the hardening of the soft mode and polarization of nano domains, but no transient THz induced ferroelectric state. On the other hand ferroelectricity in STO can be induced by in-plane strain and observed by a dramatic change in the nonlinear THz response.
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Matthias C. Hoffmann "THz driven soft mode dynamics in quantum paraelectrics", Proc. SPIE PC12683, Terahertz Emitters, Receivers, and Applications XIV, PC126830A (6 October 2023); https://doi.org/10.1117/12.2681933
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KEYWORDS
Terahertz radiation
Quantum fields
Second harmonic generation
Ultrafast phenomena
Quantum correlations
Quantum probes
Quantum regime
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