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- Title
Hidden and mirage collective modes in two dimensional Fermi liquids.
- Authors
Klein, Avraham; Maslov, Dmitrii L.; Chubukov, Andrey V.
- Abstract
The longstanding view of the zero sound mode in a Fermi liquid is that for repulsive interaction it resides outside the particle-hole continuum and gives rise to a sharp peak in the corresponding susceptibility, while for attractive interaction it is a resonance inside the particle-hole continuum. We argue that in a two-dimensional Fermi liquid there exist two additional types of zero sound: "hidden" and "mirage" modes. A hidden mode resides outside the particle-hole continuum already for attractive interaction. It does not appear as a sharp peak in the susceptibility, but determines the long-time transient response of a Fermi liquid and can be identified in pump-probe experiments. A mirage mode emerges for strong enough repulsion. Unlike the conventional zero sound, it does not correspond to a true pole, yet it gives rise to a peak in the particle-hole susceptibility. It can be detected by measuring the width of the peak, which for a mirage mode is larger than the single-particle scattering rate.
- Subjects
FERMI liquids; PARTICLE scattering functions; OPTICAL susceptibility; REPULSION-induction electric motors; CONTINUITY
- Publication
NPJ Quantum Materials, 2020, Vol 5, Issue 1, p1
- ISSN
2397-4648
- Publication type
Article
- DOI
10.1038/s41535-020-0250-4