Purely electronic THz polarization in dimer Mott insulators

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.

5 pages, 5 figures, RevTeX4

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Cited by in corpus (18)

• Absence of charge order in the dimerized κ-phase BEDT-TTF salts
• The Paired Electron Crystal: order from frustration in the quarter-filled band
• Collective excitation of electric dipole on molecular dimer in organic dimer-Mott insulator
• Near-degeneracy of extended $s+d_{x^2-y^2}$ and $d_{xy}$ order parameters in quasi-two-dimensional organic superconductors
• Anions effects on the electronic structure and electrodynamic properties of the Mott insulator $\kappa$-(BEDT-TTF)${}_2$Ag${}_2$(CN)${}_3$
• Collective Charge Excitation in a Dimer Mott Insulating System
• Metal-Insulator Transition in the Dimerized Organic Conductor $\kappa$-(BEDT-TTF)${}_2$Hg(SCN)${}_2$Br
• Coulomb enhancement of superconducting pair-pair correlations in a $\frac{3}{4}$-filled model for $\kappa$-(BEDT-TTF)${}_2$X
• Ingredients for Generalized Models of $\kappa$-Phase Organic Charge-Transfer Salts: A Review
• Optical Conductivity Measurement of a Dimer-Mott to Charge-Order Phase Transition in a Two-Dimensional Quarter-Filled Organic Salt Compound
• Quantum Melting of Magnetic Order in an Organic Dimer-Mott Insulating System
• Antiferromagnetic State in $\kappa$-type Molecular Conductors: Spin Splitting and Mott Gap
• First-principles study of the charge ordered phase in $\kappa$-D${}_3$(Cat-EDT-TTF/ST)${}_2$: Stability of $\pi$-electron deuterium coupled ordering in hydrogen-bonded molecular conductors
• Charge Oscillations Emerging after Application of an Intense Light Field to Superconductors on a Dimer Lattice
• Self-consistent field theory of polarized BEC: dispersion of collective excitation
• Spin and Charge Fluctuations near Metal-Insulator Transition in Dimer-Type Molecular Solid
• Photoinduced High-Frequency Charge Oscillations in Dimerized Systems
• Mechanism for Synchronization of Charge Oscillations in Dimer Lattices