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Interaction-mitigated Landau damping
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DOI：10.1103/PhysRevB.109.L121102.png)
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摘要
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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 (moir & eacute;) graphenelike systems.
Keyword:
DIELECTRIC-CONSTANT
GRAPHENE
期刊
IF:
3.7
论文数:
15.4W
被引数:
41.0W
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