%0 Journal Article %T Harvesting dissipated energy with a mesoscopic ratchet %+ Service de physique de l'état condensé (SPEC - UMR3680) %+ Groupe Nano-Electronique (GNE) %+ Cavendish Laboratory %A Roche, B. %A Roulleau, P. %A Jullien, T. %A Jompol, Y. %A Farrer, I. %A Ritchie, D.A. %A Glattli, D.C. %< avec comité de lecture %@ 2041-1723 %J Nature Communications %I Nature Publishing Group %V 6 %P 6738 %8 2015 %D 2015 %R 10.1038/ncomms7738 %Z Physics [physics]Journal articles %X The search for new efficient thermoelectric devices converting waste heat into electrical energy is of major importance. The physics of mesoscopic electronic transport offers the possibility to develop a new generation of nanoengines with high efficiency. Here we describe an all-electrical heat engine harvesting and converting dissipated power into an electrical current. Two capacitively coupled mesoscopic conductors realized in a two-dimensional conductor form the hot source and the cold converter of our device. In the former, controlled Joule heating generated by a voltage-biased quantum point contact results in thermal voltage fluctuations. By capacitive coupling the latter creates electric potential fluctuations in a cold chaotic cavity connected to external leads by two quantum point contacts. For unequal quantum point contact transmissions, a net electrical current is observed proportional to the heat produced. %G English %2 https://cea.hal.science/cea-01366531/document %2 https://cea.hal.science/cea-01366531/file/ncomms7738%20%281%29.pdf %L cea-01366531 %U https://cea.hal.science/cea-01366531 %~ CEA %~ CNRS %~ OPENAIRE %~ IRAMIS-SPEC %~ CEA-UPSAY %~ UNIV-PARIS-SACLAY %~ CEA-UPSAY-SACLAY %~ IRAMIS %~ GS-PHYSIQUE %~ INSTITUT-SCIENCES-LUMIERE