Optomechanics for thermal characterization of suspended graphene
| Autor: | Samer Houri, Dejan Davidovikj, Santiago J. Cartamil-Bueno, Yaroslav M. Blanter, Herre S. J. van der Zant, Robin J. Dolleman, Peter G. Steeneken |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Work (thermodynamics)
Materials science Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Graphene Time constant FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Heat capacity law.invention Thermal conductivity law 0103 physical sciences Thermal Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Interfacial thermal resistance 010306 general physics 0210 nano-technology Optomechanics |
| Zdroj: | Physical Review B (Condensed Matter and Materials Physics), 96(16) Physical Review B |
| ISSN: | 1098-0121 |
| Popis: | The thermal response of graphene is expected to be extremely fast due to its low heat capacity and high thermal conductivity. In this work, the thermal response of suspended single-layer graphene membranes is investigated by characterization of their mechanical motion in response to a high-frequency modulated laser. A characteristic delay time $\ensuremath{\tau}$ between the optical intensity and mechanical motion is observed, which is attributed to the time required to raise the temperature of the membrane. We find, however, that the measured time constants are significantly larger than the predicted ones based on values of the specific heat and thermal conductivity. In order to explain the discrepancy between measured and modeled $\ensuremath{\tau}$, a model is proposed that takes a thermal boundary resistance at the edge of the graphene drum into account. The measurements provide a noninvasive way to characterize thermal properties of suspended atomically thin membranes, providing information that can be hard to obtain by other means. |
| Databáze: | OpenAIRE |
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