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Kim, Philip
KIM GROUP
Research Interests
  • Quantum Transport in Graphene
  • Van der Waals Heterostructures
  • Low Dimensional Correlated Materials
  • Quantum engineered thermoelectric and thermal transport

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Development of high frequency and wide bandwidth Johnson noise thermometry

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Title
Development of high frequency and wide bandwidth Johnson noise thermometry
Author
Crossno, JesseLiu, XiaomengOhki, Thomas A.Kim, PhilipFong, Kin Chung
Keywords
GRAPHENE; TEMPERATURE; DISSIPATION; TRANSPORT; DEVICES
Issue Date
2015-01
Publisher
AMER INST PHYSICS
Citation
APPLIED PHYSICS LETTERS, v.106, no.2, pp.023121-1 - 023121-4
Abstract
We develop a high frequency, wide bandwidth radiometer operating at room temperature, which augments the traditional technique of Johnson noise thermometry for nanoscale thermal transport studies. Employing low noise amplifiers and an analog multiplier operating at 2 GHz, auto- and cross-correlated Johnson noise measurements are performed in the temperature range of 3 to 300 K, achieving a sensitivity of 5.5 mK (110 ppm) in 1 s of integration time. This setup allows us to measure the thermal conductance of a boron nitride encapsulated monolayer graphene device over a wide temperature range. Our data show a high power law (T similar to 4) deviation from the Wiedemann-Franz law above T similar to 100 K. (C) 2015 AIP Publishing LLC
URI
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DOI
10.1063/1.4905926
ISSN
0003-6951
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