Quantum Thermopower of Metallic Atomic-Size Contacts at Room Temperature


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EVANGELI, Charalambos, Manuel MATT, Laura RINCÓN-GARCÍA, Fabian PAULY, Peter NIELABA, Gabino RUBIO-BOLLINGER, Juan Carlos CUEVAS, Nicolás AGRAÏT, 2015. Quantum Thermopower of Metallic Atomic-Size Contacts at Room Temperature. In: Nano Letters. 15(2), pp. 1006-1011. ISSN 1530-6984. eISSN 1530-6992

@article{Evangeli2015Quant-29895, title={Quantum Thermopower of Metallic Atomic-Size Contacts at Room Temperature}, year={2015}, doi={10.1021/nl503853v}, number={2}, volume={15}, issn={1530-6984}, journal={Nano Letters}, pages={1006--1011}, author={Evangeli, Charalambos and Matt, Manuel and Rincón-García, Laura and Pauly, Fabian and Nielaba, Peter and Rubio-Bollinger, Gabino and Cuevas, Juan Carlos and Agraït, Nicolás} }

<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:bibo="http://purl.org/ontology/bibo/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > <rdf:Description rdf:about="https://kops.uni-konstanz.de/rdf/resource/123456789/29895"> <dc:creator>Cuevas, Juan Carlos</dc:creator> <dc:contributor>Pauly, Fabian</dc:contributor> <dc:creator>Rincón-García, Laura</dc:creator> <dc:contributor>Cuevas, Juan Carlos</dc:contributor> <dc:creator>Pauly, Fabian</dc:creator> <dcterms:issued>2015</dcterms:issued> <dc:contributor>Evangeli, Charalambos</dc:contributor> <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/29895"/> <dc:creator>Rubio-Bollinger, Gabino</dc:creator> <dc:contributor>Rubio-Bollinger, Gabino</dc:contributor> <dcterms:title>Quantum Thermopower of Metallic Atomic-Size Contacts at Room Temperature</dcterms:title> <dc:creator>Agraït, Nicolás</dc:creator> <dc:contributor>Rincón-García, Laura</dc:contributor> <dc:creator>Matt, Manuel</dc:creator> <dc:contributor>Nielaba, Peter</dc:contributor> <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2015-02-19T14:02:43Z</dcterms:available> <dc:contributor>Agraït, Nicolás</dc:contributor> <dc:creator>Evangeli, Charalambos</dc:creator> <dc:language>eng</dc:language> <dc:creator>Nielaba, Peter</dc:creator> <dcterms:abstract xml:lang="eng">We report conductance and thermopower measurements of metallic atomic-size contacts, namely gold and platinum, using a scanning tunneling microscope (STM) at room temperature. We find that few-atom gold contacts have an average negative thermopower, whereas platinum contacts present a positive thermopower, showing that for both metals, the sign of the thermopower in the nanoscale differs from that of bulk wires. We also find that the magnitude of the thermopower exhibits minima at the maxima of the conductance histogram in the case of gold nanocontacts while for platinum it presents large fluctuations. Tight-binding calculations and Green's function techniques, together with molecular dynamics simulations, show that these observations can be understood in the context of the Landauer-Büttiker picture of coherent transport in atomic-scale wires. In particular, we show that the differences in the thermopower between these two metals are due to the fact that the elastic transport is dominated by the 6s orbitals in the case of gold and by the 5d orbitals in the case of platinum.</dcterms:abstract> <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2015-02-19T14:02:43Z</dc:date> <dc:contributor>Matt, Manuel</dc:contributor> </rdf:Description> </rdf:RDF>

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