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Purely electronic THz polarization in dimer Mott insulators

We theoretically discover purely electronic polarization modes in THz frequency region in dimer Mott insulators $κ$-(BEDT-TTF)$_2$X. The unusual low-frequency modes arise from the coupling between the oscillation of intradimer electric dipole moments and that of alternating interdimer bond orders. These collective motions play an important role in the dynamical dielectric properties of the dimer Mott insulators. Near the phase boundary of the dimer Mott transition, the ferroelectric ground state is realized by introducing electron-lattice coupling.

preprint2010arXivOpen access
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