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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

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Coupled Electron-Phonon Hydrodynamics in Two-Dimensional Semiconductors.

Yujie Quan¹, Bolin Liao¹

¹University of California, Department of Mechanical Engineering, Santa Barbara, California 93106, USA.

Physical Review Letters

|June 23, 2025

Summary

Momentum circulation between electrons and phonons enables low-dissipation transport in two-dimensional (2D) semiconductors. This electron-phonon hydrodynamic regime enhances carrier mobility, challenging previous assumptions about strong interactions limiting performance.

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Area of Science:

Condensed Matter Physics
Materials Science

Background:

Electron-phonon interactions are crucial for charge transport in 2D semiconductors.
These interactions typically limit carrier mobility at higher temperatures.
Understanding these dynamics is key for advancing semiconductor miniaturization.

Purpose of the Study:

To investigate momentum circulation between electrons and phonons in 2D semiconductors.
To determine the impact of this circulation on carrier transport properties.
To explore the possibility of low-dissipation transport despite strong electron-phonon coupling.

Main Methods:

Systematic investigation of momentum circulation dynamics.
Analysis of coupled electron-phonon systems.
Theoretical modeling of transport properties in 2D semiconductors.

Main Results:

Strong momentum circulation leads to weak dissipation in the coupled electron-phonon system.
A coupled electron-phonon hydrodynamic transport regime emerges with joint electron-phonon drift.
Charge transport properties are significantly enhanced in this regime.

Conclusions:

Low-dissipation charge transport is achievable even with strong electron-phonon interactions.
Effective momentum circulation is key to overcoming mobility limitations.
This work advances the fundamental understanding of carrier transport in 2D materials.