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Ultra-sensitive and Wide Bandwidth Thermal Measurements of Graphene at Low Temperatures

Fong, K. C. and Schwab, K. C. (2012) Ultra-sensitive and Wide Bandwidth Thermal Measurements of Graphene at Low Temperatures. California Institute of Technology , Pasadena, CA. (Submitted) http://resolver.caltech.edu/CaltechAUTHORS:20120313-081134132

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Abstract

Graphene is a material with remarkable electronic properties[1] and exceptional thermal transport properties near room temperature, which have been well examined and understood[2, 3]. However at very low temperatures the thermodynamic and thermal transport properties are much less well explored[4, 5] and somewhat surprisingly, is expected to exhibit extreme thermal isolation. Here we demonstrate an ultra-sensitive, wide-bandwidth measurement scheme to probe the thermal transport and thermodynamic properties of the electron gas of graphene. We employ Johnson noise thermometry at microwave frequency to sensitively measure the temperature of the electron gas with resolution of 4mK/√Hz and a bandwidth of 80 MHz. We have measured the electron-phonon coupling from 2-30 K at a charge density of 2 •10^(11)cm^(-2). Utilizing bolometric mixing, we have sensed temperature oscillations with period of 430 ps and have determined the heat capacity of the electron gas to be 2 • 10^(-21)J/(K •µm^2) at 5 K which is consistent with that of a two dimensional, Dirac electron gas. These measurements suggest that graphene-based devices together with wide bandwidth noise thermometry can generate substantial advances in the areas of ultra-sensitive bolometry[6], calorimetry[7], microwave and terahertz photo-detection[8], and bolometric mixing for applications in areas such as observational astronomy[9] and quantum information and measurement[10].


Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/1202.5737arXivUNSPECIFIED
Additional Information:We acknowledge help with microfabricated LC resonators from M. Shaw, and helpful conversations with P. Kim, J. Hone, E. Hendrickson, J. P. Eisentien, A. Clerk, P. Hung, E. Wollman, A. Weinstein, B.-I. Wu, D. Nandi, J. Zmuidzinas, J. Stern, W. H. Holmes, and P. Echternach. This work has been supported by the the FCRP Center on Functional Engineering Nano Architectonics (FENA) and US NSF (DMR-0804567). We are grateful to G. Rossman for the use of a Raman spectroscopy setup. Device fabrication was performed at the Kavli Nanoscience Institute (Caltech) and at the Micro Device Laboratory (NASA/JPL). The authors declare that they have no competing financial interests.
Group:Institute for Quantum Information and Matter, IQIM
Funders:
Funding AgencyGrant Number
FCRP Center on Functional Engineering Nano Architectonics (FENA)UNSPECIFIED
NSFDMR-0804567
Record Number:CaltechAUTHORS:20120313-081134132
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120313-081134132
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:29696
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:14 May 2012 23:28
Last Modified:26 Dec 2012 14:56

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