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Investigation of the inelastic neutron scattering spectra inFe$_{1+y}$Te$_{1-x}$Se$_{x}$ near a signature wave vector $\mathbf{Q} =(1,0,0)$ for the bond-order wave (BOW) formation of parent compoundFe$_{1+y}$Te [Phys. Rev. Lett. 112, 187202 (2014)] reveals anacoustic-phonon-like dispersion present in all structural phases. While astructural Bragg peak accompanies the mode in the low-temperature phase ofFe$_{1+y}$Te, it is absent in the high-temperature tetragonal phase, whereBragg scattering at this $\mathbf{Q}$ is forbidden by symmetry. Notably, thismode is also observed in superconducting FeTe$_{0.55}$Se$_{0.45}$, wherestructural and magnetic transitions are suppressed, and no BOW has beenobserved. The presence of this "forbidden" phonon indicates that the latticesymmetry is dynamically or locally broken by magneto-orbital BOW fluctuations,which are strongly coupled to lattice in these materials.

"Forbidden" phonon: dynamical signature of bond symmetry breaking in the iron chalcogenides