%0 Journal Article %1 PhysRevB.109.L121102 %A Wang, Xuepeng %A Moessner, Roderich %A Chowdhury, Debanjan %D 2024 %I American Physical Society %J Phys. Rev. B %K b %N 12 %P L121102 %R 10.1103/PhysRevB.109.L121102 %T Interaction-mitigated Landau damping %U https://link.aps.org/doi/10.1103/PhysRevB.109.L121102 %V 109 %X 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.

@article{PhysRevB.109.L121102, 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. }, added-at = {2024-06-12T11:31:15.000+0200}, author = {Wang, Xuepeng and Moessner, Roderich and Chowdhury, Debanjan}, biburl = {https://www.bibsonomy.org/bibtex/25769675d2d0c4b424f8c756be30aeb83/ctqmat}, day = 06, doi = {10.1103/PhysRevB.109.L121102}, interhash = {b0429f6a3260beb84ff2c6a09452b979}, intrahash = {5769675d2d0c4b424f8c756be30aeb83}, journal = {Phys. Rev. B}, keywords = {b}, month = {03}, number = 12, numpages = {6}, pages = {L121102}, publisher = {American Physical Society}, timestamp = {2024-06-12T11:31:15.000+0200}, title = {Interaction-mitigated Landau damping}, url = {https://link.aps.org/doi/10.1103/PhysRevB.109.L121102}, volume = 109, year = 2024 }