Purely electronic THz polarization in dimer Mott insulators

Hiroki Gomi; Takayuki Imai; Akira Takahashi; Masaki Aihara

doi:10.1103/PhysRevB.82.035101

Purely electronic THz polarization in dimer Mott insulators

Strongly Correlated Electrons 2015-05-18 v1

Authors: Hiroki Gomi , Takayuki Imai , Akira Takahashi , Masaki Aihara

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Abstract

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.

Keywords

metal-insulator transition topological insulator topological insulators

Cite

@article{arxiv.1003.4589,
  title  = {Purely electronic THz polarization in dimer Mott insulators},
  author = {Hiroki Gomi and Takayuki Imai and Akira Takahashi and Masaki Aihara},
  journal= {arXiv preprint arXiv:1003.4589},
  year   = {2015}
}

Comments

5 pages, 5 figures, RevTeX4

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