Three-Dimensional Topological Semimetal/Insulator States in α-Type Organic Conductors with Interlayer Spin-Orbit Interaction

Abstract

We have studied the tight-binding model for the α-type layered organic conductors, α-(ET)2I3 and α-(BETS)2I3, with a uniform interlayer coupling accompanied by spin-orbit interaction originating from the I3- anion potential. The model preserves the time reversal and inversion symmetries. In α-(ET)2I3, the interlayer spin-orbit coupling realizes the experimentally suggested Dirac semimetal state with inversion symmetry. In contrast, the inversion breaking in interlayer hoppings realizes the Weyl semimetal state without spin-orbit coupling. In α-(BETS)2I3, the proposed strong topological insulator is hardly realized with inversion symmetry.

16 pages,4 figures

References in corpus (11)

• Topological Insulators with Inversion Symmetry
• Phase transition between the quantum spin Hall and insulator phases in 3D: emergence of a topological gapless phase
• Classification of stable three-dimensional Dirac semimetals with nontrivial topology
• Topological Mott Insulators
• Importance of Spin-Orbit Coupling in Organic BEDT-TTF and BEDT-TSF Salts
• Pressure-induced phase switching of the Shubnikov de Haas oscillations in molecular Dirac fermion system $\alpha -$(BETS)${}_2$I${}_3$
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• Theory for Planar Hall Effect in Organic Dirac Fermion System

Cited by in corpus (2)

• 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