Conductive domain walls in ferroelectrics as tunable coherent THz radiation source

Ramaz Khomeriki; Kathrin Dörr; Jamal Berakdar

Conductive domain walls in ferroelectrics as tunable coherent THz radiation source

Materials Science 2025-09-03 v1 Other Condensed Matter Applied Physics

Authors: Ramaz Khomeriki , Kathrin Dörr , Jamal Berakdar

Abstract

THz emission associated with currents in conductive domains in BiFeO $_3$ following infrared radiation is theoretically investigated. This experimentally observed phenomenon is explained by the domain wall stripes acting as metallic resonators with the oscillating charge accumulation being at the domain wall edges. The charge oscillation frequency is related to the plasma frequency inside the domain wall. The value of plasma frequency determines both the frequency and the amplitude of the emission emanating from the BiFeO $_3$ lattice. We show that for certain geometries of the domain wall structure and for specific polarization of the incident pulse the THz emission embodies a non-vanishing chirality.

Keywords

Terahertz emission ferroelectrics conductive domain walls BiFeO3 chirality plasma frequency infrared radiation

Cite

@article{arxiv.2509.01542,
  title  = {Conductive domain walls in ferroelectrics as tunable coherent THz radiation source},
  author = {Ramaz Khomeriki and Kathrin Dörr and Jamal Berakdar},
  journal= {arXiv preprint arXiv:2509.01542},
  year   = {2025}
}

Conductive domain walls in ferroelectrics as tunable coherent THz radiation source

Abstract

Keywords

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