Universal collective Larmor-Silin mode emerging in magnetized correlated Dirac fermions

Abstract

Employing large-scale quantum Monte Carlo simulations, we find that in the magnetized interacting Dirac fermion model there emerges a universal collective Larmor-Silin spin wave mode in the transverse dynamical spin susceptibility. Such mode purely originates from the interaction among Dirac fermions and distinguishes itself from the usual particle-hole continuum with finite lifetime and clear dispersion, both at small and large momenta in a large portion of the Brillouin zone. Our unbiased numerical results offer the dynamic signature of this collective excitation in interacting Dirac fermion systems, and provide experimental guidance for inelastic neutron scattering, electron spin resonance, and other spectroscopic approaches in the investigation of such universal collective modes in quantum Moire materials, topological insulators, and quantum spin liquid materials under magnetic field, with quintessential interaction nature beyond the commonly assumed noninteracting Dirac fermion or spinon approximations.

12 pages, 6 figures

References in corpus (20)

• Projected wavefunction study of Spin-1/2 Heisenberg model on the Kagome lattice
• Fermionic quantum criticality in honeycomb and $\pi$-flux Hubbard models: Finite-size scaling of renormalization-group-invariant observables from quantum Monte Carlo
• Nearly deconfined spinon excitations in the square-lattice spin-1/2 Heisenberg antiferromagnet
• Progress on stochastic analytic continuation of quantum Monte Carlo data
• Using the average spectrum method to extract dynamics from quantum Monte Carlo simulations
• Roton spectroscopy in a harmonically trapped dipolar Bose-Einstein condensate
• Spectral evidence for Dirac spinons in a kagome lattice antiferromagnet
• Multiple Magnetorotons and Spectral Sum Rules in Fractional Quantum Hall Systems
• Dirac fermions with plaquette interactions. I. SU(2) phase diagram with Gross-Neveu and deconfined quantum criticalities
• Thermodynamic characteristic for correlated flat-band system with quantum anomalous Hall ground state
• Neutral Excitations of Quantum Hall States: a Density Matrix Renormalization Group Study
• Dirac fermions with plaquette interactions. II. SU(4) phase diagram with Gross-Neveu criticality and quantum spin liquid
• Thermodynamic Response and Neutral Excitations in Integer and Fractional Quantum Anomalous Hall States Emerging from Correlated Flat Bands
• Magnetic field induced semimetal-to-canted-antiferromagnet transition on the honeycomb lattice
• Dirac fermions with plaquette interactions. III. SU(N) phase diagram with Gross-Neveu criticality and first-order phase transition
• Spinon excitations in the XX chain: spectra, transition rates, observability
• From Fractional Quantum Anomalous Hall Smectics to Polar Smectic Metals: Nontrivial Interplay Between Electronic Liquid Crystal Order and Topological Order in Correlated Topological Flat Bands
• Magnetically ordered and kagome quantum spin liquid states in the Zn-doped claringbullite series
• Larmor precession in strongly correlated itinerant electron systems
• Collective spin oscillations in a magnetized graphene sheet