Observation of an anisotropic Dirac cone reshaping and ferrimagnetic spin polarization in an organic conductor

Abstract

The Coulomb interaction among massless Dirac fermions in graphene is unscreened around the isotropic Dirac points, causing a logarithmic velocity renormalization and a cone reshaping. In less symmetric Dirac materials possessing anisotropic cones with tilted axes, the Coulomb interaction can provide still more exotic phenomena which have not been experimentally unveiled yet. Here, using site-selective nuclear magnetic resonance, we find a non-uniform cone reshaping accompanied by a bandwidth reduction and an emergent ferrimagnetism in tilted Dirac cones that appear on the verge of charge ordering in an organic compound. Our theoretical analyses based on the renormalization-group approach and the Hubbard model show that these observations are the direct consequences of the long-range and short-range parts of the Coulomb interaction, respectively. The cone reshaping and the bandwidth renormalization, as well as the novel magnetism revealed here, can be ubiquitous and vital for many Dirac materials.

43 pages, 6 figures, 1 table; to appear in Nature Communications

References in corpus (16)

• The electronic properties of graphene
• Dirac materials
• Classification of stable three-dimensional Dirac semimetals with nontrivial topology
• Infrared spectroscopy of Landau levels in graphene
• Tilted anisotropic Dirac cones in quinoid-type graphene and alpha-(BEDT-TTF)_2I_3
• Merging of Dirac points in a two-dimensional crystal
• Charge Ordering in alpha-(BEDT-TTF)2I3 by synchrotron x-ray diffraction
• Quantum transport in Dirac materials: signatures of tilted and anisotropic Dirac and Weyl cones
• Effects of the Zero-Mode Landau Level on Inter-Layer Magnetoresistance in Multilayer Massless Dirac Fermion Systems
• Quantum Criticality of Topological Phase Transitions in 3D Interacting Electronic Systems
• Possible Verification of Tilted Anisotropic Dirac Cone in α-(BEDT-TTF)_2 I_3 Using Interlayer Magnetoresistance
• Electronic Properties Close to Dirac Cone in Two-Dimensional Organic Conductor $\alpha$-(BEDT-TTF)${}_2$I${}_3$
• Landau level spectroscopy of electron-electron interactions in graphene
• Electric-field-induced lifting of the valley degeneracy in alpha-(BEDT-TTF)_2I_3 Dirac-like Landau levels
• Renormalization Effects on Quasi-Two-Dimensional Organic Conductor α-(BEDT-TTF)2I3
• Unusual hyperfine interaction of Dirac electrons and NMR spectroscopy in graphene

Cited by in corpus (20)

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• Molecular Quantum Materials: Electronic Phases and Charge Dynamics in Two-Dimensional Organic Solids
• Effect of the type I to type II Weyl semimetal topological transition on superconductivity
• Band-gap engineering, magnetic behavior and Dirac-semimetal character in the MoSi2N4 nanoribbon with armchair and zigzag edges
• Synthetic non-Abelian gauge fields and gravitomagnetic effects in tilted Dirac cone systems
• C${}_4$N${}_3$H monolayer: A novel two-dimensional organic Dirac material with high Fermi velocity
• Magneto-optical conductivity of anisotropic two-dimensional Dirac-Weyl materials
• Type-III Dirac Cones from Degenerate Directionally Flat Bands: Viewpoint from Molecular-Orbital Representation
• Experimental Confirmation of Massive Dirac Fermions in Weak Charge-Ordering State in α-(BEDT-TTF)_2I_3
• Quantum Phase Transition in Organic Massless Dirac Fermion System $\alpha$-(BEDT-TTF)${}_2$I${}_3$ under pressure
• Dynamical gap generation in 2D Dirac semimetal with deformed Dirac cone
• Predicted photoinduced pair annihilation of emergent magnetic charges in the organic salt $\alpha$-(BEDT-TTF)${}_2$I${}_3$ irradiated by linearly polarized light
• Anomalous Spin Transport Properties of Gapped Dirac Electrons with Tilting
• Possible Nonlinear Anomalous Thermoelectric Effect in Organic Massive Dirac Fermion System
• Tight-Binding Model and Electronic Property of Dirac Nodal Line in Single-Component Molecular Conductor [Pt(dmdt)${}_2$]
• Electric Transport of Nodal Line Semimetal in Single-Component Molecular Conductor
• Insights into thermal transport property of monolayer C${}_4$N${}_3$H: a first-principles study
• Thermoelectric Effect at Quantum Limit in Two-Dimensional Organic Dirac Fermion System with Zeeman Splitting
• Excitonic pairing of two-dimensional Dirac fermions near the antiferromagnetic quantum critical point
• Nonlinear optical response of Type-II Weyl fermions in two dimensions