2013/12/17 by S. Yigen, Serap Yiğen, A. R. Champagne · 64 citations
Engineering · Materials Science · Physics and Astronomy · #Condensed matter physics #Conductivity #Electrical resistivity and conductivity #Electron #Gate voltage #Graphene #Graphene research and applications #Materials science #Nanotechnology #Omega #Physics #Quantum mechanics #Thermal Radiation and Cooling Technologies #Thermal conductivity #Thermal properties of materials #Transistor #Voltage #Wiedemann–Franz law #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1021/nl403967z
published in Nano Letters 14(1), 289-293 (American Chemical Society) · Supplemental Online Information available at: http://physics.concordia.ca/faculty/alex/Yigen_Champagne_Nano_SI.pdf
openalex publication_date 2013/12/17 · arxiv created 2014/01/13 · arxiv updated 2014/01/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We extract experimentally the electronic thermal conductivity, Ke, in suspended graphene that we dope using a back-gate electrode. We make use of two-point dc electron transport at low bias voltages and intermediate temperatures (50-160 K), where the electron and lattice temperatures are decoupled. The thermal conductivity is proportional to the charge conductivity times the temperature, confirming that the Wiedemann-Franz relation is obeyed in suspended graphene. We extract an estimate of the Lorenz coefficient as 1.1-1.7 × 10(-8) W ΩK(-2). Ke shows a transistor effect and can be tuned with the back-gate by more than a factor of 2 as the charge carrier density ranges from ∼0.5 to 1.8 × 10(11) cm(-2).