Evidence for three-dimensional Dirac semimetal state in strongly correlated organic quasi-two-dimensional material

Abstract

The three-dimensional Dirac semimetal is distinct from its two-dimensional counterpart due to its dimensionality and symmetry. Here, we observe that molecule-based quasi-two-dimensional Dirac fermion system, $\alpha$-(BEDT-TTF)${}_2$I${}_3$, exhibits chiral anomaly-induced negative magnetoresistance and planar Hall effect upon entering the coherent inter-layer tunneling regime under high pressure. Time-reversal symmetry is broken due to the strong electronic correlation effect, while the spin-orbit coupling effect is negligible. The system provides an ideal platform for investigating the chiral anomaly physics by controlling dimensionality and strong electronic correlation.

arXiv comment5 pages, 6 figures

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Cited by in corpus (4)

• Three-Dimensional Topological Semimetal/Insulator States in α-Type Organic Conductors with Interlayer Spin-Orbit Interaction
• Wannier Center Analysis on Possible Three-Dimensional Topological Phases in α-Type Layered Organic Conductors
• Time-Reversal Symmetry-Breaking Flux State in an Organic Dirac Fermion System
• Anomalous Phase-Coherence Scaling in a Quantum-Critical Dirac Semimetal