期刊
PHYSICAL REVIEW B
卷 96, 期 16, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.96.165421
关键词
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资金
- Dutch Technology Foundation (STW) part of the Netherlands Organisation for Scientific Research (NWO) [13307]
- Ministry of Economic Affairs
- European Union's Horizon research and innovation program [649953]
- Netherlands Organisation for Scientific Research (NWO/OCW), as part of the Frontiers of Nanoscience program
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 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 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.
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