Terahertz Electrodynamics of $180^{\circ }$ Domain Walls in Thin Ferroelectric Films

Abstract

We investigate oscillation dynamics of a periodic structure of the $180^{\circ }$ domain walls in nanometricaly thin substrate-deposited ferroelectric films and superlattices. We calculate dynamic permittivity of such structures and reveal a collective resonance mode, which in the typical ferroelectric compounds, PbTiO3/SrTiO3, lies in the sub- and low THz frequency range of 0.3-3THz. We propose the reflection-absorbtion spectroscopy experiments to observe this mode.

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