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Data from Graduate School of Nanoscience and Technology Advance Knowledge in Physics (Seebeck effect at the atomic scale)

July 8, 2014

By a News Reporter-Staff News Editor at Physics Week -- Investigators publish new report on Physics. According to news reporting originating in Daejeon, South Korea, by VerticalNews journalists, research stated, "The atomic variations of electronic wave functions at the surface and electron scattering near a defect have been detected unprecedentedly by tracing thermoelectric voltages given a temperature bias [Cho et al., Nat. Mater. 12, 913 (2013)]. Because thermoelectricity, or the Seebeck effect, is associated with heat-induced electron diffusion, how the thermoelectric signal is related to the atomic-scale wave functions and what the role of the temperature is at such a length scale remain very unclear."

The news reporters obtained a quote from the research from the Graduate School of Nanoscience and Technology, "Here we show that coherent electron and heat transport through a pointlike contact produces an atomic Seebeck effect, which is described by the mesoscopic Seebeck coefficient multiplied by an effective temperature drop at the interface. The mesoscopic Seebeck coefficient is approximately proportional to the logarithmic energy derivative of local density of states at the Fermi energy. We deduced that the effective temperature drop at the tip-sample junction could vary at a subangstrom scale depending on atom-to-atom interaction at the interface."

According to the news reporters, the research concluded: "A computer-based simulation method of thermoelectric images is proposed, and a point defect in graphene was identified by comparing experiment and the simulation of thermoelectric imaging."

For more information on this research see: Seebeck effect at the atomic scale. Physical Review Letters, 2014;112(13):136601. (American Physical Society -; Physical Review Letters -

Our news correspondents report that additional information may be obtained by contacting E.S. Lee, Graduate School of Nanoscience and Technology, KAIST, Daejeon 305-701, South Korea. Additional authors for this research include S. Cho, H.K. Lyeo and Y.H Kim.

Keywords for this news article include: Asia, Daejeon, Physics, South Korea.

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Source: Physics Week

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