Spatially-Resolved Phonon Hydrodynamic Flow from First Principles

ORAL

Abstract

Material hydrodynamic regimes are characterized by numerous scattering events, each of which conserves quasi-momentum and thus doesn’t oppose the flow of carriers. Recent observations of non-resistive carrier transport in two-dimensional materials suggest that hydrodynamic flow can occur over a wide range of temperatures1. In thermal transport, hydrodynamic flow manifests itself in two separate phenomena: the wavelike propagation of heat, termed second sound, and parabolic heat profiles, reminiscent of classical incompressible fluid pipe flow.
Theoretical efforts to characterize and predict such phenomena are often restricted to momentum-space, effectively assuming spatial homogeneity. However, hydrodynamic flow exhibits strong real-space signatures. In this talk, we extend previous work and solve the phonon Boltzmann Transport Equation using both spatial and momentum resolution2. We present ab initio calculations of hydrodynamic phenomena in real-space in experimentally-realizable geometries.
1S. Huberman, R. A. Duncan, K. A. Nelson, et. al, Science 26 (2019)
2G. Varnavides, A. S. Jermyn, P. Anikeeva, and P. Narang, Phys. Rev. B 100, 115402 (2019).

*GV and PN acknowledge funding from the DARPA DSO on Driven and Nonequilibrium Quantum Systems and the ONR grant (N00014-18-1-2691).

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Presenters

  • Georgios Varnavides

    • Massachusetts Institute of Technology MIT

Authors

  • Georgios Varnavides

    • Massachusetts Institute of Technology MIT

  • Adam Jermyn

    • Center for Computational Astrophysics, Simons Foundation, Flatiron Institute

  • Polina Anikeeva

    • Massachusetts Institute of Technology MIT

  • Prineha Narang

    • SEAS, Harvard University
    • Harvard University
    • John A. Paulson School of Engineering and Applied Sciences, Harvard University
    • School of Engineering and Applied Sciences, Harvard University
    • Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University
    • Harvard University; Aliro Technologies