26
views
0
recommends
+1 Recommend
0 collections
0
shares
• Record: found
• Abstract: found
• Article: found
Is Open Access

# Lattice vibrations of the charge-transfer salt $$\kappa$$-(BEDT-TTF)$$_2$$Cu$$_2$$(CN)$$_{3}$$: novel interpretation of the electrodynamic response in a spin-liquid compound

Preprint

Bookmark
There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

### Abstract

The dimer Mott insulator $$\kappa$$-(BEDT-TTF)$$_2$$Cu$$_2$$(CN)$$_3$$ exhibits unusual electrodynamic properties. Numerical investigations of the electronic ground state and the molecular and lattice vibrations reveal the importance of the Cu$$_2$$(CN)$$_3^-$$ anion network coupled to the BEDT-TTF molecules: The threefold cyanide coordination of copper and linkage isomerism in the anion structure cause a loss of symmetry, frustration, disorder, and domain formation. Our findings consistently explain the temperature and polarization-dependent THz and infrared measurements, reinforce the understanding of dielectric properties and have important implications for the quantum spin-liquid state, which should be treated beyond two-dimensional, purely electronic models.

### Most cited references2

• Record: found

### Thermal-transport measurements in a quantum spin-liquid state of the frustrated triangular magnet -(BEDT-TTF)2Cu2(CN)3

(2008)
Bookmark
• Record: found
• Abstract: found
• Article: found
Is Open Access

### Phonon switching and combined Fano-Rice effect in optical spectra of bilayer graphene

(2010)
Recent infrared measurements of phonon peaks in gated bilayer graphene reveal two striking signatures of electron-phonon interaction: an asymmetric Fano lineshape and a giant variation of the peak intensity as a function of the applied gate voltage. In this Letter we provide a unified theoretical framework which accounts for both these effects and unveils the occurrence of a switching mechanism between the symmetric ($$E_g$$) and anti-symmetric ($$E_u$$) phonon mode as dominant channel in the optical response. A complete phase diagram of the optical phonon response is also presented, as a function of both the charge density and the bandgap.
Bookmark

### Author and article information

###### Journal
1601.04926
10.1103/PhysRevB.93.081201

Condensed matter