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Para-hydrodynamics from weak surface scattering in ultraclean thin flakes.

Yotam Wolf¹, Amit Aharon-Steinberg¹, Binghai Yan¹

¹Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, Israel.

Nature Communications

|April 22, 2023

Summary

New research introduces para-hydrodynamics, a novel electron transport regime. This occurs when momentum-conserving scattering replaces electron-electron interactions in materials like WTe2, enabling new electronic behaviors.

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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

Published on: December 4, 2017

Area of Science:

Condensed Matter Physics
Materials Science
Theoretical Physics

Background:

Electron hydrodynamics usually requires frequent electron-electron collisions.
Thin tungsten ditelluride (WTe2) flakes exhibit unusual electron transport.
Alternative scattering mechanisms can drive hydrodynamic behavior.

Purpose of the Study:

To develop a kinetic theory for the para-hydrodynamic transport regime.
To explain electron transport in materials where electron-electron interactions are weak.
To connect microscopic scattering properties to macroscopic transport phenomena.

Main Methods:

Developed kinetic theory for a ballistic electron gas in a thin 3D sheet.
Modeled boundary scattering effects on momentum-relaxing (lmr) and momentum-conserving (lmc) mean free paths.
Derived an effective mean free path based on sheet boundary parameters.

Main Results:

Predicted that para-hydrodynamics (lmr >> lmc) generally occurs in ultraclean 3D materials.
The effective mean free path is directly linked to microscopic sheet boundary properties.
Successfully reproduced WTe2 transport properties in the para-hydrodynamic regime.

Conclusions:

Para-hydrodynamics is a viable transport regime beyond electron-electron interactions.
Boundary scattering plays a crucial role in enabling para-hydrodynamics.
The developed theory accurately describes experimental observations in WTe2.