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Thermoelectric imaging of structural disorder in epitaxial graphene
Cho, Sanghee,Kang, Stephen Dongmin,Kim, Wondong,Lee, Eui-Sup,Woo, Sung-Jae,Kong, Ki-Jeong,Kim, Ilyou,Kim, Hyeong-Do,Zhang, Tong,Stroscio, Joseph A.,Kim, Yong-Hyun,Lyeo, Ho-Ki Nature Publishing Group, a division of Macmillan P 2013 Nature materials Vol.12 No.10
Heat is a familiar form of energy transported from a hot side to a colder side of an object, but not a notion associated with microscopic measurements of electronic properties. A temperature difference within a material causes charge carriers, electrons or holes to diffuse along the temperature gradient inducing a thermoelectric voltage. Here we show that local thermoelectric measurements can yield high-sensitivity imaging of structural disorder on the atomic and nanometre scales. The thermopower measurement acts to amplify the variations in the local density of states at the Fermi level, giving high differential contrast in thermoelectric signals. Using this imaging technique, we uncovered point defects in the first layer of epitaxial graphene, which generate soliton-like domain-wall line patterns separating regions of the different interlayer stacking of the second graphene layer.
김원동,황찬용,Ilyou Kim 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.7
Mn core-level spectra of Mn/Au(001) and Mn/Pt(001) systems are investigated by using X-ray photoemission spectroscopy. For the Mn/Au(001) system, large satellite structures which are very similar to those found previously in Mn/Cu(001) and Mn/Ag(001) systems, are also observed in the Mn 2p core level spectra. On the other hand, such large satellite structures are not observed in the case of the Mn/Pt(001) system. Considering the results of the structural analysis, these results indicate that the large satellite effect observed in Mn thin film systems is mainly related to the hybridization of Mn d electrons with the substrate, not to the effect of low-dimensionality as claimed in previous reports.