Hidden and mirage collective modes in two dimensional Fermi liquids

Avraham Klein, Dmitrii L. Maslov, Andrey V. Chubukov

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

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.

Original languageEnglish (US)
Article number55
Journalnpj Quantum Materials
Volume5
Issue number1
DOIs
StatePublished - Dec 1 2020

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