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

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Cited by in corpus (57)

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• Nonlinear Valley Hall Effect
• Ambient pressure Dirac electron system in quasi-two-dimensional molecular conductor $\alpha$-(BETS)${}_2$I${}_3$
• Anisotropic effects in two-dimensional materials
• Band-gap engineering, magnetic behavior and Dirac-semimetal character in the MoSi2N4 nanoribbon with armchair and zigzag edges
• First-principles study of the effective Hamiltonian for Dirac fermions with spin-orbit coupling in two-dimensional molecular conductor $\alpha$-(BETS)${}_2$I${}_3$
• Hyperbolic plasmons in massive tilted 2D Dirac materials
• Large Diamagnetism and Electromagnetic Duality in Two-dimensional Dirac Electron System
• Synthetic non-Abelian gauge fields and gravitomagnetic effects in tilted Dirac cone systems
• Magneto-optical conductivity of anisotropic two-dimensional Dirac-Weyl materials
• Tilted Dirac cone effects and chiral symmetry breaking in a planar four-fermion model
• C${}_4$N${}_3$H monolayer: A novel two-dimensional organic Dirac material with high Fermi velocity
• Transport properties of organic Dirac electron system α-(BEDT-TSeF)${}_2$I${}_3$
• Observation of Possible Nonlinear Anomalous Hall Effect in Organic Two-Dimensional Dirac Fermion System
• Interaction-induced quantum spin Hall insulator in the organic Dirac electron system $\alpha$-(BEDT-TSeF)${}_2$I${}_3$
• Pressure-induced phase switching of the Shubnikov de Haas oscillations in molecular Dirac fermion system $\alpha -$(BETS)${}_2$I${}_3$
• Type-III Dirac Cones from Degenerate Directionally Flat Bands: Viewpoint from Molecular-Orbital Representation
• Possible Current-Induced Phenomena and Domain Control in an Organic Dirac Fermion System with Weak Charge Ordering
• Quantum electrodynamics in anisotropic and tilted Dirac photonic lattices
• Quantum Phase Transition in Organic Massless Dirac Fermion System $\alpha$-(BEDT-TTF)${}_2$I${}_3$ under pressure
• Experimental Confirmation of Massive Dirac Fermions in Weak Charge-Ordering State in α-(BEDT-TTF)_2I_3
• Dynamical gap generation in 2D Dirac semimetal with deformed Dirac cone
• Gap opening mechanism for correlated Dirac electrons in organic compounds $\alpha$-(BEDT-TTF)${}_2$I${}_3$ and $\alpha$-(BEDT-TSeF)${}_2$I${}_3$
• Identification of strongly interacting organic semimetals
• Universal Behavior of Magnetoresistance in Organic Dirac Electron Systems
• Relativistic Mott transitions and finite-temperature effects of quantum criticality in Dirac semimetals
• Predicted photoinduced pair annihilation of emergent magnetic charges in the organic salt $\alpha$-(BEDT-TTF)${}_2$I${}_3$ irradiated by linearly polarized light
• Superconducting phase transition in planar fermionic models with Dirac cone tilting
• Thermal difference reflectivity of tilted 2D Dirac materials
• Anomalous Spin Transport Properties of Gapped Dirac Electrons with Tilting
• Electric and Magnetic Responses of Two-dimensional Dirac Electrons in Organic Conductor $\alpha$-(BETS)${}_2$I${}_3$
• 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
• Seebeck Effect of Dirac Electrons in Organic Conductors under Hydrostatic Pressure Using a Tight-Binding Model Derived from First Principles
• Inducing anisotropies in Dirac fermions by periodic driving
• Fast nuclear spin relaxation rates in tilted cone Weyl semimetals: Redshift factors from Korringa relation
• Fano resonances for tilted linear and quadratic band touching dispersions in a harmonically driven potential well
• Smart Holes: Analogue black holes with the right temperature and entropy
• Seebeck Coefficient of Two-dimensional Dirac Electrons in Organic Conductor under Pressure
• Magnetic-field-induced electronic instability of Weyl-like fermions in compressed black phosphorus
• Crossover in Electronic Specific Heat near Narrow-Sense Type-III Dirac Cones
• 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
• Spin-Orbit Coupling Effect on the Seebeck Coefficient in Dirac Electron Systems in $\alpha$-(BETS)${}_2$I${}_3$
• Possible Spin-Density Wave on Fermi Arc of Edge State in Single-Component Molecular Conductors [Pt(dmdt)${}_2$] and [Ni(dmdt)${}_2$]
• 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
• A Lorentz-violating low-energy model for the bilayer Graphene
• Ambient-Pressure Organic Dirac Electron State in $\alpha$-(BETS)${}_2$AuCl${}_2$
• Hofstadter Butterfly and Broken-Symmetry Quantum Hall States in α-Type Organic Dirac Fermion Systems
• Aslamazov Larkin Conductivity in Weyl Semimetals
• Fragment-orbital-dependent spin fluctuations in the single-component molecular conductor [Ni(dmdt)${}_2$]
• Anomalous Phase-Coherence Scaling in a Quantum-Critical Dirac Semimetal
• Nonlinear optical response of Type-II Weyl fermions in two dimensions