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Optomechanical method for characterizing thermal transport across suspended van der Waals interfaces

Journal Article (2026)
Author(s)

Hanqing Liu (TU Delft - Mechanical Engineering, National University of Defense Technology)

Saurabh Lodha (Indian Institute of Technology Bombay)

Herre S.J. van der Zant (TU Delft - Applied Sciences, Kavli institute of nanoscience Delft)

Peter G. Steeneken (TU Delft - Mechanical Engineering, Kavli institute of nanoscience Delft)

Gerard J. Verbiest (TU Delft - Mechanical Engineering)

Research Group
QN/van der Zant Lab
DOI related publication
https://doi.org/10.1088/2053-1583/aeaa6b Final published version
More Info
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Publication Year
2026
Language
English
Research Group
QN/van der Zant Lab
Journal title
2D Materials
Issue number
4
Volume number
13
Article number
045009
Page Views
9
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Abstract

For the development of nanoscale electronics and photonics using atomically thin two-dimensional (2D) materials, it is important to realize van der Waals (vdW) interfaces with low thermal resistance, to minimize performance reduction caused by heat accumulation. However, characterizing the thermal interface resistance between vdW materials is still a challenge. Here, we introduce a novel optomechanical methodology to characterize the thermal transport across interfaces in suspended 2D heterostructures. We first determine the specific heat and thermal conductivity as a function of temperature for the upper and lower multilayer 2D materials separately and then extract the thermal boundary conductance (TBC) of the heterostructure from its thermal time constant. We obtain a TBC of (Formula presented) (Formula presented) and (Formula presented) (Formula presented) (Formula presented) (Formula presented) for the suspended FePS (Formula presented) (Formula presented) /WSe (Formula presented) (Formula presented) and MoS (Formula presented) (Formula presented) /FePS (Formula presented) (Formula presented) interfaces, respectively, which are comparable to values reported in the literature. Moreover, they agree with a Debye model including the acoustic impedance mismatch of acoustic phonons. This work enables efficient thermal management down to the nanoscale and offers new insights into energy dissipation in vdW heterostructures.