Observation of Possible Nonlinear Anomalous Hall Effect in Organic Two-Dimensional Dirac Fermion System

Abstract

We report the observation of nonlinear anomalous Hall effect (NLAHE) in the multilayered organic conductor $\alpha$-(BEDT-TTF)${}_2$I${}_3$ in the charge order (CO) insulating phase just under the critical pressure for transition into two-dimensional (2D) massless Dirac fermion (DF) phase. We successfully extracted the finite nonlinear Hall voltage proportional to square current at zero magnetic field. The observed NLAHE features, current direction dependence and correlation with CO, are consistent with the previous estimation assuming 2D massive DF with a pair of tilted Dirac cones. This is the first observation of topological transport in organic conductors, and also the first example of NLAHE in the electronic phase with spontaneous symmetry breaking.

arXiv comment22 pages, 4 figures, with 3 pages supplementary information and 2 supplementary figures

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Cited by in corpus (8)

• Nonlinear Hall Effects
• Quantum theory of the nonlinear Hall effect
• Tunable Topology and Berry Curvature Dipole in Transition Metal Dichalcogenide Janus Monolayers
• Room-temperature nonlinear transport and microwave rectification in antiferromagnetic MnBi${}_2$Te${}_4$ films
• Chirality-tunable non-linear Hall effect
• Third-order Electrical Conductivity of the Charge-ordered Organic Salt $\alpha$-(BEDT-TTF)${}_2$I${}_3$
• Anomalous Phase-Coherence Scaling in a Quantum-Critical Dirac Semimetal
• Hall Shift Current and Nonlinear Anomalous Hall Effect in Gapped Dirac Fermion Systems