Purely electronic THz polarization in dimer Mott insulators

Details Purely electronic THz polarization in dimer Mott insulators Purely electronic THz polarization in dimer Mott insulators

2010-03-24

arxiv.org/abs/1003.4589v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures, RevTeX4

Scientific paper

We theoretically discover purely electronic polarization modes in THz frequency region in dimer Mott insulators $\kappa$-(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.

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