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Ferroelectric domain walls (DWs) are nanoscale topological defects that canbe easily tailored to create nanoscale devices. Their excitations, recentlydiscovered to be responsible for DW GHz conductivity, hold promise for fastersignal transmission and processing speed compared to the existing technology.Here we find that DW phonons disperse from GHz to THz frequencies, thusexplaining the origin of the surprisingly broad GHz signature in DWconductivity. Puzzling activation of nominally silent DW sliding modes inBiFeO3 is traced back to DW tilting and resulting asymmetry in wall-localizedphonons. The obtained phonon spectra and selection rules are used to simulatescanning impedance microscopy, emerging as a powerful probe in nanophononics.The results will guide experimental discovery of the predicted phonon branchesand design of DW-based nanodevices.

Activation of nominally silent domain wall-localized phonons from GHz to THz frequencies