Preprint Article Version 1 This version is not peer-reviewed

Optical Conductivity on Charge Order Transition in Organic Dirac Electron System α-(BEDT-TTF)2I3

Version 1 : Received: 25 February 2018 / Approved: 26 February 2018 / Online: 26 February 2018 (10:39:40 CET)

A peer-reviewed article of this Preprint also exists.

Ohki, D.; Matsuno, G.; Omori, Y.; Kobayashi, A. Optical Conductivity in a Two-Dimensional Extended Hubbard Model for an Organic Dirac Electron System α-(BEDT-TTF)2I3. Crystals 2018, 8, 137. Ohki, D.; Matsuno, G.; Omori, Y.; Kobayashi, A. Optical Conductivity in a Two-Dimensional Extended Hubbard Model for an Organic Dirac Electron System α-(BEDT-TTF)2I3. Crystals 2018, 8, 137.

Journal reference: Crystals 2018, 8, 137
DOI: 10.3390/cryst8030137

Abstract

The optical conductivity in the charge order phase is calculated in the extended Hubbard model describing an organic Dirac electron system α-(BEDT-TTF)2I3 using the mean field theory and the Nakano-Kubo formula. A peak structure due to interband excitation being characteristic in two-dimensional Dirac electron system is found above the charge order gap. It is shown that the peak structure originates from the Van Hove singularities of the conduction and valence bands, where those singularities are located at a saddle point between two Dirac cones in momentum space. The frequency of the peak structure exhibits drastic change in the vicinity of the charge order transition.

Subject Areas

Dirac electron; charge order; optical conductivity; organic conductor; α-(BEDT-TTF)2I3

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