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ferroelectricity 1local-field effects 1nonlinear optics 1soft phonon modes 1SrTiO3 1terahertz spectroscopy 1

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cond-mat.mtrl-sci2026

Soft-mode nonlinearities away from ferroelectric phase transition

Payel Shee, Ipek Efe, Jingwen Li +3

The paper investigates how electronic polarizability and local-field effects influence the soft optical phonon mode in paraelectric SrTiO₃, using linear and two‑dimensional teraher…