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Correlation Histograms in Conductance Measurements of Nanowires Formed at Semiconductor Interfaces

100%
Wawrzyniak M., Martinek J., Susła B., Ilnicki G.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
384-386
EN
We demonstrate experimentally that conductance steps can occur in nanowires formed at metal-semiconductor junctions, between a cobalt tip and a germanium surface revealing long-duration plateaus at reproducible levels. The high reproducibility of the conductance traces obtained leads to very sharp peaks in the conductance histogram suggesting formation of stable atomic configurations. We develop a new type of correlation analysis of the preferred conductance values that provide new type of information on a few-atomic-nanocontact formation dynamics.
2
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Cotunneling Transport at Singlet-Triplet Transition in Carbon Nanotube Quantum Dots

88%
Ilnicki G., Moriyama S., Martinek J., Fuse T., Ishibashi K.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
299-302
EN
Electronic transport through a quantum dot in the Coulomb-blockade cotunelling regime is investigated both experimentally and theoretically, where a single-wall carbon-nanotube weakly coupled to metallic leads plays a role of the dot. We observe a pronounced current peak for the singlet-triplet transition in a half-shell filling regime due to inelastic cotunneling processes. Using the second order perturbation theory we explain physical mechanisms determining the details of signal.
3
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Zero-Bias Anomaly in Magnetic Tunnel Junctions

88%
Yang H., Yang S., Ilnicki G., Martinek J., Parkin S.
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issue 2
316-318
EN
We present experimental results, which may indicate the possibility of the coexistence of the Kondo effect and ferromagnetism in macroscopic planar magnetic tunnel junctions with a layer of nanodots inside tunnel barriers. A conductance double peak structure was observed. Magnetic field dependence of the splitting of a conductance peak, and temperature evolution of the conductance curves are well explained from the theoretical point of view according to the predictions of the Kondo physics and cotunneling in the Anderson quantum dot coupled to ferromagnetic leads.
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