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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

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Electrically-driven reversible phonon transport manipulation in two-dimensional heterostructures.

Yufei Sheng¹, Hongxin Zhu², Siqi Xie²

¹Global Institute of Future Technology, Shanghai Jiao Tong University, Shanghai, China.

Nature Communications

|February 25, 2025

Summary

Scientists achieved reversible control over heat flow (phonon transport) in a novel material using electrical voltage. This breakthrough offers new possibilities for thermal management in electronics and advanced semiconductor technologies.

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Phonon transport manipulation is vital for thermal management, thermoelectric energy conversion, and thermal insulation.
Current methods for controlling phonon transport are limited, especially regarding reversibility.

Purpose of the Study:

To demonstrate reversible manipulation of phonon transport in a monolayer MoSe2-WSe2 heterojunction.
To explore electrical modulation of thermal conductivity for advanced thermal design.

Main Methods:

Fabrication of a monolayer MoSe2-WSe2 heterojunction.
Measurement of thermal conductivity under varying bias voltages (forward and reverse cutoff).
Theoretical modeling, device simulation, and first-principles calculations to elucidate the underlying mechanisms.

Main Results:

Achieved reversible modulation of phonon thermal conductivity by switching bias voltage.
Observed significantly lower thermal conductivity under electrical forward bias compared to reverse cutoff.
Demonstrated that this effect is more pronounced at lower temperatures.
Elucidated the decrease in thermal conductivity under forward bias due to increased carrier concentrations and electron temperatures.

Conclusions:

Successfully demonstrated an electrically-driven approach for phonon transport manipulation.
The findings open avenues for dynamical and reversible thermal management in semiconductor devices.
This work provides a new strategy for designing advanced thermal management systems.