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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

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      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.

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

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

        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.
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          Author and article information

          Journal
          1601.04926
          10.1103/PhysRevB.93.081201

          Condensed matter

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