Workshop book - Physikzentrum der RWTH Aachen - RWTH Aachen ...

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$Planungsraster FP C SoSe2013 Di. 13:30-18:00 h Gruppe \ Tag 9.4 ...$

Posters Tuesday February 5 Poster 34: Spin-orbit effects in electronic transport in DNA-CNT hybrids Sergio Ulloa We report on theoretical studies of electronic transport in the archetypical molecular hybrid formed by DNA wrapped around single-walled carbon nanotubes (CNTs). Using a Green’s function formalism in a π-orbital tightbinding representation, we investigate the role that spin-orbit interactions play on the CNT in the case of the helicoidal electric field induced by the polar nature of the adsorbed DNA molecule. We find that spin polarization of the current can take place in the absence of magnetic fields, depending strongly on the direction of the wrapping and length of the helicoidal field. These findings open new routes for using CNTs in spintronic devices. Poster 35: Covalent functionalization of carbon nanotubes with tetramanganese complexes Robert Frielinghaus We present first results on the covalent chemical functionalization of carbon nanotubes (CNTs) with polynuclear Mn 4 coordination complexes. Raman spectra give direct and indirect evidence of a successful reaction. It can only be achieved for tubes which contain defects with carboxylic groups. Changes in the magnetization behavior of the Mn 4 complexes due to the bonding to the CNTs are analyzed using data obtained in temperature-dependent SQUID measurements. These results are correlated with bright- and dark field high-resolution transmission electron microscopy measurements that show the repartition of the Mn 4 decoration on the CNTs. Its elemental analysis capabilities, energydispersive x-ray spectroscopy and electron energy loss spectroscopy, proof the existence of Mn on the CNTs. Investigating several oxidation strengths we can show that already a mild oxidation that leaves the nanotubes intact in terms of a finite electrical conductance is sufficient for functionalization. This is important for the future application of this material in transport devices. 80
Posters Tuesday February 5 Poster 36: Analysis of quantum transport features in complex carbon nanotube structures Robert Frielinghaus We have investigated two carbon nanotubes (CNTs) both in quantum transport and in the transmission electron microscope by means of a novel sample design. This enables us to determine the device structure unambiguously as a two-fold single-walled CNT bundle and an individual triple-walled CNT, respectively. The corresponding low-temperature transport experiments are, to our knowledge, the first ones unambiguously conducted on these very systems. The stability diagrams exhibit complex features as anti-crossings, Fano-shaped coulomb peaks, and regular sawtooth patterns. The origin of these features is only found with the detailed knowledge about the atomic structure, which cannot be obtained with standard sample layouts. More precisely, we measure capacitive and molecular interactions between the various elements of the devices and the environment. Poster 37: Nanomechanical read-out of a single spin Philipp Struck The spin of a single electron in a suspended carbon nanotube can be read out by using its coupling to the nano-mechanical motion of the nanotube. To show this, we consi<strong>der</strong> a single electron confined within a quantum dot formed by the suspended carbon nanotube. The spin- orbit interaction induces a coupling between the spin and one of the bending modes of the suspended part of the nanotube. We calculate the response of the system to pulsed external driving of the mechanical motion using a Jaynes-Cummings model. To account for resonator damping, we solve a quantum master equation, with parameters comparable to those used in recent experiments, and show how information of the spin state of the system can be acquired by measuring its mechanical motion. The latter can be detected by observing the current through a nearby charge detector.[1] [1] P. R. Struck, H. Wang, G. Burkard, arXiv:1212.1569 81
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PROGRAM BOOK International workshop
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What comes with this booklet With t
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Getting to the institute (1) If you
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Workshop lecture hall • The works
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Lunch information Lunch will be tak
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Talks Monday February 4 Talk progra
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Talks Monday February 4 Notes 13
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Page 29 and 30: Talks Tuesday February 5 Talks Tues
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