SmallTalks [about Nanoscience] Graphene heat capacity measurements

​​​Welcome to a seminar in the series SmallTalks [about Nanoscience] arranged by the Excellence Initiative Nano​. Aamir Ali, postdoc at Quantum Techology Laboratory, Department of Microtechnology and Nanoscience will talk about Graphene heat capacity measurements. 

The seminar will be held both live and on Zoom 
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Heat capacity is an invaluable quantity in physics and chemistry. But, it has been out of reach of measurements in 2D materials such as graphene, because it is extremely small, thermal processes happen too fast, and suitable nanoscale thermometers are generally lacking. In the first part of the talk, I will give a brief overview of why thermal physics is interesting in 2D materials, especially heat capacity. I will close with an introduction to Johnson noise thermometer which is an excellent tool for thermal physics with nanoscale electronic systems. 

In the second half of the talk, I will present our experimental technique that has allowed the first ever measurements of the electronic heat capacity of graphene. It is based on a union of a Johnson noise  thermometer, that measures electronic temperature (Te) with a sensitivity of 20 mK/Hz1/2, with a photomixed optical heater that modulates Te at a frequency of up to 0.2 THz. This allows record sensitive measurements of the electronic heat capacity Ce < 10−19 J/K and the fastest measurement of electronic thermal relaxation time < 10 −12 second yet achieved by a calorimeter. These features advance heat capacity metrology into the realm of nanoscale and low-dimensional systems and unlock a new, powerful approach to 2D materials research.  

Reference: M. A. Aamir et. al., Ultrasensitive Calorimetric Measurements of the Electronic Heat Capacity of Graphene, Nano Lett. 2021, 21, 12, 5330 - 5337.​

Looking forward to seeing you live or on Zoom:

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Category Seminar
Location: Kollektorn, and on Zoom
Starts: 21 February, 2022, 15:00
Ends: 21 February, 2022, 16:00

Page manager Published: Fri 11 Feb 2022.