Time-Reversal Symmetry-Breaking Flux State in an Organic Dirac Fermion System
Abstract
We investigate symmetry breaking in the Dirac fermion phase of the organic compound α-(BEDT-TTF)2I3 under pressure, where BEDT-TTF denotes bis(ethylenedithio)tetrathiafulvalene. The exchange interaction resulting from inter-molecule Coulomb repulsion leads to broken time-reversal symmetry and particle-hole symmetry while preserving translational symmetry. The system breaks time-reversal symmetry by creating fluxes in the unit cell. This symmetry-broken state exhibits a large Nernst signal as well as thermopower. We compute the Nernst signal and thermopower, demonstrating their consistency with experimental results.
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