Department of Physics, California Institute of Technology, Pasadena, California 91125, USA.
T. J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, USA.
Nano Lett. 2023 May 24;23(10):4136-4141. doi: 10.1021/acs.nanolett.2c04791. Epub 2023 May 10.
Due to its exceptional electronic and thermal properties, graphene is a key material for bolometry, calorimetry, and photon detection. However, despite graphene's relatively simple electronic structure, the physical processes responsible for the heat transport from the electrons to the lattice are experimentally still elusive. Here, we measure the thermal response of low-disorder graphene encapsulated in hexagonal boron nitride by integrating it within a multiterminal superconducting microwave resonator. The device geometry allows us to simultaneously apply Joule heat power to the graphene flake while performing calibrated readout of the electron temperature. We probe the thermalization rates of both electrons and holes with high precision and observe a thermalization scaling exponent not consistent with cooling through the graphene bulk and argue that instead it can be attributed to processes at the graphene-aluminum interface. Our technique provides new insights into the thermalization pathways essential for the next-generation graphene thermal detectors.
由于其出色的电子和热性能，石墨烯是量热法、量热法和光子探测的关键材料。然而，尽管石墨烯的电子结构相对简单，但负责将热量从电子传递到晶格的物理过程在实验上仍然难以捉摸。在这里，我们通过将低无序石墨烯封装在六方氮化硼中，并将其集成到多端超导微波谐振器中来测量其热响应。该器件几何形状允许我们在对石墨烯薄片施加焦耳热功率的同时，对电子温度进行校准读取。我们高精度地探测了电子和空穴的热化率，并观察到热化标度指数与通过石墨烯体冷却不一致，并认为这可以归因于石墨烯-铝界面的过程。我们的技术为下一代石墨烯热探测器的热平衡途径提供了新的见解。
