Direct electronic measurement of Peltier cooling and heating in graphene
journal contributionposted on 19.04.2018, 11:25 by I.J. Vera-Marun, J.J. van den Berg, Fasil DejeneFasil Dejene, B.J. van Wees
Thermoelectric effects allow the generation of electrical power from waste heat and the electrical control of cooling and heating. Remarkably, these effects are also highly sensitive to the asymmetry in the density of states around the Fermi energy and can therefore be exploited as probes of distortions in the electronic structure at the nanoscale. Here we consider two-dimensional graphene as an excellent nanoscale carbon material for exploring the interaction between electronic and thermal transport phenomena, by presenting a direct and quantitative measurement of the Peltier component to electronic cooling and heating in graphene. Thanks to an architecture including nanoscale thermometers, we detected Peltier component modulation of up to 15 mK for currents of 20 μA at room temperature and observed a full reversal between Peltier cooling and heating for electron and hole regimes. This fundamental thermodynamic property is a complementary tool for the study of nanoscale thermoelectric transport in two-dimensional materials.
We acknowledge the financial support of the Netherlands Organisation for Scientific Research (NWO), the Zernike Institute for Advanced Materials, the Dutch Foundation for Fundamental Research on Matter (FOM) and the European Union Seventh Framework Programmes ConceptGraphene (No. 257829), Graphene Flagship (No. 604391) and the Future and Emerging Technologies (FET) programme under FETOpen grant number 618083 (CNTQC).