Tuning heat transport in graphene by tension

Tuning heat transport in graphene by tension

Liu, Hanqing (TU Delft Dynamics of Micro and Nano Systems)
Lee, M. (TU Delft BN/Nynke Dekker Lab; Kavli institute of nanoscience Delft)
Siskins, M. (TU Delft Dynamics of Micro and Nano Systems; Kavli institute of nanoscience Delft)
van der Zant, H.S.J. (TU Delft QN/van der Zant Lab; Kavli institute of nanoscience Delft)
Steeneken, P.G. (TU Delft Dynamics of Micro and Nano Systems; Kavli institute of nanoscience Delft)
Verbiest, G.J. (TU Delft Dynamics of Micro and Nano Systems)

2023

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.

http://resolver.tudelft.nl/uuid:08ba74f4-d7a0-4a94-88c9-f4288cfedf98

https://doi.org/10.1103/PhysRevB.108.L081401

2469-9950

Physical Review B, 108 (8)

Institutional Repository

journal article

© 2023 Hanqing Liu, M. Lee, M. Siskins, H.S.J. van der Zant, P.G. Steeneken, G.J. Verbiest