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Para-hydrodynamics from weak surface scattering in ultraclean thin flakes

Author

Listed:
  • Yotam Wolf

    (Weizmann Institute of Science)

  • Amit Aharon-Steinberg

    (Weizmann Institute of Science)

  • Binghai Yan

    (Weizmann Institute of Science)

  • Tobias Holder

    (Weizmann Institute of Science)

Abstract

Electron hydrodynamics typically emerges in electron fluids with a high electron–electron collision rate. However, new experiments with thin flakes of WTe2 have revealed that other momentum-conserving scattering processes can replace the role of the electron–electron interaction, thereby leading to a novel, so-called para-hydrodynamic regime. Here, we develop the kinetic theory for para-hydrodynamic transport. To this end, we consider a ballistic electron gas in a thin three-dimensional sheet where the momentum-relaxing (lmr) and momentum-conserving (lmc) mean free paths are decreased due to boundary scattering from a rough surface. The resulting effective mean free path of the in-plane components of the electronic flow is then expressed in terms of microscopic parameters of the sheet boundaries, predicting that a para-hydrodynamic regime with lmr ≫ lmc emerges generically in ultraclean three-dimensional materials. Using our approach, we recover the transport properties of WTe2 in the para-hydrodynamic regime in good agreement with existing experiments.

Suggested Citation

  • Yotam Wolf & Amit Aharon-Steinberg & Binghai Yan & Tobias Holder, 2023. "Para-hydrodynamics from weak surface scattering in ultraclean thin flakes," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-37966-z
    DOI: 10.1038/s41467-023-37966-z
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