Tuning heat transport in graphene by tension
Hanqing Liu, Martin Lee, Makars Šiškins, Herre S. J. van der Zant, Peter G. Steeneken, Gerard J. Verbiest
Abstract
The speed of sound and flexural phonons in two-dimensional materials depends strongly on the tension in these ultraflexible membranes. Here, the authors experimentally demonstrate that freestanding graphene membranes cool down 33% faster when increasing tension by electrostatic gating. They attribute this effect mainly to improved acoustic impedance match of flexural phonons at the boundaries of the membrane and thus provide a route towards electronic devices and circuits for high-speed control of nanoscale heat transport.
Topics & Concepts
GrapheneTension (geology)PhononMaterials scienceMembraneFlexural strengthNanoscopic scaleElectronic circuitOptoelectronicsNanotechnologyCondensed matter physicsComposite materialPhysicsUltimate tensile strengthChemistryBiochemistryQuantum mechanicsThermal properties of materialsThermal Radiation and Cooling TechnologiesGraphene research and applications