Three-terminal energy harvester with coupled quantum dots

Holger Thierschmann, Rafael Sánchez, Björn Sothmann, Fabian Arnold, Christian Heyn, Wolfgang Hansen, Hartmut Buhmann, Laurens W. Molenkamp

Research output: Contribution to journalArticleScientificpeer-review

126 Citations (Scopus)

Abstract

Rectification of thermal fluctuations in mesoscopic conductors is the key idea behind recent attempts to build nanoscale thermoelectric energy harvesters to convert heat into useful electric power. So far, most concepts have made use of the Seebeck effect in a two-terminal geometry, where heat and charge are both carried by the same particles. Here, we experimentally demonstrate the working principle of a new kind of energy harvester, proposed recently, using two capacitively coupled quantum dots. We show that, due to the novel three-terminal design of our device, which spatially separates the heat reservoir from the conductor circuit, the directions of charge and heat flow become decoupled. This enables us to manipulate the direction of the generated charge current by means of external gate voltages while leaving the direction of heat flow unaffected. Our results pave the way for a new generation of multi-terminal nanoscale heat engines.

Original languageEnglish
Pages (from-to)854-858
Number of pages5
JournalNature Nanotechnology
Volume10
Issue number10
DOIs
Publication statusPublished - 1 Oct 2015

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    Thierschmann, H., Sánchez, R., Sothmann, B., Arnold, F., Heyn, C., Hansen, W., Buhmann, H., & Molenkamp, L. W. (2015). Three-terminal energy harvester with coupled quantum dots. Nature Nanotechnology, 10(10), 854-858. https://doi.org/10.1038/nnano.2015.176