Interaction-mitigated Landau damping

Abstract

Bosonic collective modes are ubiquitous in metals, but over a wide range of energy and momenta suffer from Landau damping, decaying into the continuum of particle-hole excitations. Here we point out that interactions can suppress this decay, protecting a finite fraction of the total spectral weight associated with the collective mode, e.g. a plasmon. The underlying mechanism is level repulsion between a discrete mode and the continuum. We demonstrate the effect using a number of simplified models of strongly correlated Fermi-liquid metals, including a ``solvable" random flavor model in the large$-N$ limit. We discuss in detail the possibility of observing such an avoided decay for plasmons in (moiré) graphene-like systems.

arXiv comment13 pages, 6 figures

References in corpus (29)

• Electronic transport in two dimensional graphene
• Moire bands in twisted double-layer graphene
• Gate-tuning of graphene plasmons revealed by infrared nano-imaging
• Dielectric function, screening, and plasmons in 2D graphene
• Dynamical polarization of graphene at finite doping
• Maximally-localized Wannier orbitals and the extended Hubbard model for the twisted bilayer graphene
• Ultra-confined acoustic THz graphene plasmons revealed by photocurrent nanoscopy
• Twisted bilayer graphene III. Interacting Hamiltonian and exact symmetries
• Plasmon-phonon coupling in graphene
• Cooper pairing of incoherent electrons: an electron-phonon version of the Sachdev-Ye-Kitaev model
• Twisted bilayer graphene I. Matrix elements, approximations, perturbation theory and a $k\cdot p$ 2-Band model
• Collective excitations in twisted bilayer graphene close to the magic angle
• Coulomb interaction, phonons, and superconductivity in twisted bilayer graphene
• Solvable Strong-coupling Quantum Dot Model with a Non-Fermi-liquid Pairing Transition
• Strong quantum interactions prevent quasiparticle decay
• Intrinsically Undamped Plasmon Modes in Narrow Electron Bands
• Large $N$ theory of critical Fermi surfaces II: conductivity
• Nano-photocurrent mapping of local electronic structure in twisted bilayer graphene
• A critical strange metal from fluctuating gauge fields in a solvable random model
• Quantum Phase Transition in the Yukawa-SYK Model
• Anomalous attenuation of plasmons in strange metals and holography
• A new class of SYK-like models with maximal chaos
• Dirac Fast Scramblers
• Decay of quasiparticles in quantum spin liquids
• Ward identities for strongly coupled Eliashberg theories
• Phase diagram of the spin-1/2 Yukawa-SYK model: Non-Fermi liquid, insulator, and superconductor
• Effect of nodes, ellipticity and impurities on the spin resonance in Iron-based superconductors
• Transition from acoustic plasmon to electronic sound in graphene
• Collective density fluctuations of strange metals with critical Fermi surfaces