Phonon hydrodynamics in crystalline materials

TL;DR

This review explores the emerging field of phonon hydrodynamics in crystalline materials, highlighting its unconventional collective phonon motion, experimental and analytical advancements, and potential applications in thermal management and nanoelectronics.

Contribution

It provides a comprehensive overview of recent developments, combining phenomenological and material science perspectives, and discusses factors influencing phonon hydrodynamics and future research directions.

Findings

Recent experimental evidence of phonon hydrodynamics

Development of analytical and numerical modeling techniques

Potential applications in thermal management and nanoelectronics

Abstract

Phonon hydrodynamics is an exotic phonon transport phenomenon that challenges the conventional understanding of diffusive phonon scattering in crystalline solids. It features a peculiar collective motion of phonons with various unconventional properties resembling fluid hydrodynamics, facilitating non Fourier heat transport. Hence, it opens up several new avenues to enrich the knowledge and implementations on phonon physics, phonon engineering, and micro and nanoelectronic device technologies. This review aims at covering a comprehensive development as well as the recent advancements in this field via experiments, analytical methods, and state-of-the-art numerical techniques. The evolution of the topic has been realized using both phenomenological and material science perspectives. Further, the discussions related to the factors that influence such peculiar motion, illustrate the capability of phonon hydrodynamics to be implemented in various applications. A plethora of new ideas can emerge from the topic considering both the physics and the material science axes, navigating towards a promising outlook in the research areas around phonon transport in non-metallic solids.