Phonon hydrodynamics in bulk insulators and semi-metals
arxiv(2024)
摘要
Decades ago, Gurzhi proposed that if momentum-conserving collisions prevail
among heat-carrying phonons in insulators and charge-carrying electrons in
metals, hydrodynamic features will become detectable. In this paper, we will
review the experimental evidence emerging in the last few years supporting this
viewpoint and raising new questions. The focus of the paper will be bulk
crystals without (or with a very dilute concentration) of mobile electrons and
steady-state thermal transport. We will also discuss the possible link between
this field of investigation and other phenomena, such as the hybridization of
phonon modes and the phonon thermal Hall effect.
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