Dynamical time-reversal and inversion symmetry breaking, dimensional crossover, and chiral anomaly in $\alpha$-(BEDT-TTF)${}_2$I${}_3$

Abstract

In most Dirac semimetals, time-reversal and inversion symmetries are believed to play a crucial role in their stability. We demonstrate that these symmetries are broken in Dirac fermions in the organic conductor $\alpha$-(BEDT-TTF)${}_2$I${}_3$ due to the strong electronic correlation. The system is a three-dimensional type-II Dirac semimetal in the coherent inter-layer tunneling regime. A chiral anomaly is predicted to be observed in the magnetoresistance when the magnetic field is tuned to the inter-layer tunneling direction. Our result suggests that $\alpha$-(BEDT-TTF)${}_2$I${}_3$ is a useful platform to explore the interplay between the chiral anomaly and the strong correlation and/or dimensionality.

6+3 pages, 2+1 figures

References in corpus (7)

• The electronic properties of graphene
• Classification of stable three-dimensional Dirac semimetals with nontrivial topology
• Tilted anisotropic Dirac cones in quinoid-type graphene and alpha-(BEDT-TTF)_2I_3
• Chiral anomaly and transport in Weyl metals
• Effects of the Zero-Mode Landau Level on Inter-Layer Magnetoresistance in Multilayer Massless Dirac Fermion Systems
• Possible Verification of Tilted Anisotropic Dirac Cone in α-(BEDT-TTF)_2 I_3 Using Interlayer Magnetoresistance
• Importance of Spin-Orbit Coupling in Organic BEDT-TTF and BEDT-TSF Salts

Cited by in corpus (9)

• Coherent interlayer coupling in quasi-two-dimensional Dirac fermions in $\alpha$-(BEDT-TTF)${}_2$I${}_3$
• Correlation-driven organic 3D topological insulator with relativistic fermions
• Evidence for three-dimensional Dirac semimetal state in strongly correlated organic quasi-two-dimensional material
• Three-Dimensional Topological Semimetal/Insulator States in α-Type Organic Conductors with Interlayer Spin-Orbit Interaction
• Observations of $\nu =1$ Quantum Hall Effect and Inter-Band Effects of Magnetic fields on Hall Conductivity in Organic Massless Dirac Fermion System $\alpha$-(BETS)${}_2$I${}_3$ under Pressure
• Theory for Planar Hall Effect in Organic Dirac Fermion System
• Time-Reversal Symmetry-Breaking Flux State in an Organic Dirac Fermion System
• Wannier Center Analysis on Possible Three-Dimensional Topological Phases in α-Type Layered Organic Conductors
• Anomalous Phase-Coherence Scaling in a Quantum-Critical Dirac Semimetal