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Symposium Quantum Shot Noise in Nanostructures Montag Hauptvortrag SYSN 2.2 Mo 16:30 H1 Full Counting Statistics of Multiple Andreev Reflections — •Juan Carlos Cuevas — Institut für Theoretische Festkörperphysik,Universität Karlsruhe, D-76128 Karlsruhe The complete understanding of the electronic transport in mesoscopic systems requires information that goes beyond the analysis of the current. In this sense, the ultimate goal is the determination of the full current distribution. In the context of superconductivity the basic situation, in which this full distribution had not been yet investigated, is a point contact between two superconductors out of equilibrium, where the transport properties at subgap voltages are dominated by multiple Andreev reflections (MAR). In this talk I will present our recent results, which demonstrate that in superconducting contacts at finite voltage the charge transport is described by a multinomial distribution of multiple charge transfers. This proves that in the MAR processes the charge is transmitted in large quanta. We have obtained analytically the MAR probabilities, from which all transport properties are easily computed. Our result constitutes the culmination of the recent progress in the understanding of MARs, which are a key concept in mesoscopic superconductivity. SYSN 2.3 Mo 17:00 H1 Shot noise in resonant single electron tunneling through InAs quantum dots — •Frank Hohls 1 , André Nauen 1 , Niels Maire 1 , Rolf Haug 1 , and Klaus Pierz 2 — 1 Institut für Festkörperphysik, Universität Hannover, D-30167 — 2 Physikalisch-Technische Bundesanstalt, Bundesallee 100, We investigate the noise properties of resonant single electron transport through self-assembled InAs quantum dots which are embedded in the AlAs barrier of a GaAs-AlAs-GaAs tunneling device. Due to their small size (diameter 10-15 nm and height 3 nm) these quantum dots display both strong size quantization and Coulomb blockade. Thus the tunneling current through our device is given by resonant single electron tunneling through the ground state of the quantum dot. The measured noise spectrum of the current is dominated by frequencyindependent shot noise for frequencies above 1 kHz. As expected for single electron tunneling the spectral noise power S is suppressed in comparison to the full Poissonian shot noise 2eI observed for single barrier tunneling. We observe a linear voltage dependence of the suppression α = S/2eI which can be related to the dimensionality of the source contacts. At the onset of the resonant current we observe additional features which are probably caused by a correlation effect between dot and lead known as fermi edge singularity. SYSN 2.4 Mo 17:15 H1 Shot noise of coherent tunneling through Coulomb interacting quantum dots — •G. Kießlich, A. Wacker, and E. Schöll — Institut für Theoretische Physik, TU Berlin, Hardenbergstr. 36, 10623 Berlin The spectral power density of the tunneling current through quantum dots can help to clarify the transition from sequential (particlelike) to coherent (wavelike) mesoscopic transport. In the high temperature limit kBT ≫ Γ (Γ is the linewidth of the resonant quantum dot level) the noise and the current are well described by sequential tunneling using a Pauli master equation approach [1] which is in good agreement with experimental data [2]. For intermediate temperatures kBT ≃ Γ we derive the noise behavior starting from the Anderson Hamiltonian using a nonequilibrium Green’s function technique. In this framework we treat the tunneling coupling to the reservoirs exactly, and the Coulomb interaction in the quantum dot is included perturbatively beyond the Hartree approximation. The effect of Coulomb repulsion on the bias dependence of the noise in the sequential and coherent regime will be shown in detail. [1] G. Kießlich, A. Wacker, and E. Schöll, Phys. Rev. B 68, 125320 (2003) [2] G. Kießlich, A. Wacker, E. Schöll, A. Nauen, F. Hohls, and R.J. Haug, Phys. Status Solidi C 0, 1293 (2003) SYSN 2.5 Mo 17:30 H1 Frequency Dispersion in Full Counting Statistics — •Sebastian Pilgram 1 , Kirill Nagaev 2 , and Markus Büttiker 1 — 1 Département de Physique Théorique, Université de Genève, CH-1211, Genève, Switzerland — 2 Institute of Radioengineering and Electronics, Russian Academy of Sciences, Mokhovaga ulica 11, 125009 Moscow, Russia Transport of electrons through disordered mesoscopic conductors is considered in the semiclassical regime. We express the full transport statistics of current in terms of a stochastic path integral. In the semiclassical limit, this path integral may be evaluated in the saddle point approximation. The formalism is used to study the frequency dispersion of higher order correlation functions. Investigating both ballistic cavities and diffusive wires, we find surprisingly that the third cumulant of full current statistics shows a low-frequency dispersion which is absent in noise correlators. This dispersion is associated with charge neutral fluctuations of the electron occupation function and exists in the regime of non-interacting electrons as well as in the presence of strong electronelectron scattering (Reference: K.E. Nagaev, S. Pilgram, and M. Buttiker, cond-mat/0306465).
Symposium X-RAY Magneto-Optics Tagesübersichten X-RAY MAGNETO-OPTICS (SYXM) Priv.-Doz. Dr. Kai Starke Magnetic Materials Spectroscopy Freie Universität Berlin Fachbereich Physik Arnimallee 14 14195 Berlin E-Mail: starke@physik.fu-berlin.de Prof. Dr. Hubert Ebert Ludwig-Maximilians-Universität München Department Chemie Physikalische Chemie Butenandtstraße 11 81377 München E-Mail: hubert.ebert@cup.uni-muenchen.de Intense soft x-ray beams with variable light polarization from synchrotron radiation sources are widely used to investigate nanoscale heteromagnetic structures. When tuning to inner-shell absorption edges resonant x-ray magnetic scattering gives rise to magneto-optical signals in transmission, specular reflection, and diffuse reflection. As unique features of x-ray magneto-optics, (i) the information depth can be varied by orders of magnitude from surface to bulk sensitive, and (ii) interference becomes significant when the soft x-ray wavelength is comparable with the nanometer dimensions of layered magnetic structures. – This symposium is jointly held by the sections Magnetism and Surface Science of the Condensed Matter Division in the German Physical Society. Seven invited speakers highlight various aspects of the field, reaching from principles of x-ray magneto-optics, its application to magnetometry, the possibility of using coherent scattering to image and study dynamics of magnetic domains, to recent theoretical and experimental achievements in research on magnetic transition metal clusters and single atoms deposited on surfaces. Hauptvorträge ÜBERSICHT DER HAUPTVORTRÄGE UND FACHSITZUNGEN (Hörsaal H1) SYXM 1.1 Di 14:30 (H1) Magneto-optical polarisation spectroscopy with soft x-rays, Hans-Christoph Mertins, Sergio Valencia, Andreas Gaupp, Wolfgang Gudat, Peter Oppeneer SYXM 1.2 Di 15:00 (H1) Magnetization profiling by resonant magnetic x-ray reflectometry, G. Schütz, J. Geissler, E. Goering SYXM 1.3 Di 15:30 (H1) X-ray magneto-optics of lanthanide materials: principles and applications, José Emilio Prieto, Franziskus Heigl, Oleg Krupin, Kristian Döbrich, Günter Kaindl, Kai Starke SYXM 1.4 Di 16:00 (H1) Resonant soft x-ray diffuse scattering from magnetic multilayers, Maurizio Sacchi, Carlo Spezzani, Renaud Delaunay, Coryn F. Hague SYXM 1.5 Di 16:30 (H1) Ab-initio calculations for adatoms and clusters on surfaces, Peter H. Dederichs SYXM 1.6 Di 17:00 (H1) Magnetic properties of mass selected transition metal clusters, Wilfried Wurth, Leif Glaser, Tobias Lau, Michael Martins, Robert Nietuby`c, Matthias Reif SYXM 1.7 Di 17:30 (H1) Coherent x-ray scattering and lensless imaging of magnetic materials, Stefan Eisebitt, Marcus Lörgen, Wolfgang Eberhardt, Jan Lüning, Joachim Stöhr Fachsitzungen SYXM 1 X-Ray Magneto-Optics Di 14:30–18:00 H1 SYXM 1.1–1.7
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Page 469 and 470: Symposium Life Sciences on the Nano
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Page 485 and 486: Symposium Functional Nanoparticles
Page 487 and 488: Symposium Organic and Hybrid System
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