Tuning heat transport in graphene by tension

Journal article (2023)

Authors

Hanqing Liu Dynamics of Micro and Nano Systems - Mechanical, Maritime and Materials Engineering
M. Lee Kavli institute of nanoscience Delft, BN/Nynke Dekker Lab - AS
M. Siskins Kavli institute of nanoscience Delft, Dynamics of Micro and Nano Systems - Mechanical, Maritime and Materials Engineering
H.S.J. van der Zant QN/van der Zant Lab - AS , Kavli institute of nanoscience Delft
P.G. Steeneken Kavli institute of nanoscience Delft, Dynamics of Micro and Nano Systems - Mechanical, Maritime and Materials Engineering
G.J. Verbiest Dynamics of Micro and Nano Systems - Mechanical, Maritime and Materials Engineering
Research Group
Dynamics of Micro and Nano Systems (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2023 Hanqing Liu, M. Lee, M. Siskins, H.S.J. van der Zant, P.G. Steeneken, G.J. Verbiest
DOI: https://doi.org/10.1103/PhysRevB.108.L081401
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Published Date

2023

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Precision and Microsystems Engineering

Research Group

Dynamics of Micro and Nano Systems

Abstract

Heat transport by acoustic phonons in two-dimensional (2D) materials is fundamentally different from that in 3D crystals because the out-of-plane phonons propagate in a unique way that strongly depends on tension and bending rigidity. Here, using optomechanical techniques, we experimentally demonstrate that the heat transport time in freestanding graphene membranes is significantly higher than the theoretical prediction, and decreases by as much as 33% due to an electrostatically induced tension of 0.07 N/m. Using phonon scattering and Debye models, we explain these observations by the tension-enhanced acoustic impedance match of flexural phonons at the boundary of the graphene membrane. Thus, we experimentally elucidate the tunability of phononic heat transport in 2D materials by tension, and open a route towards electronic devices and circuits for high-speed control of temperature at the nanoscale.