Colloquia Winter 2004 / 2005

Date / Venue	Title / Author
Monday, 13.9.2004 HS1, Institute of Physics Time: 14:00h	Ultraminiature mechanical devices for single-molecule and single-quantum nanoscience Prof. Dr. Michael L. Roukes, Director, Kavli Nanoscience Institute Advanced techniques in nanoscience now enable the creation of ultrasmall mechanical devices. These nanoelectromechanical systems (NEMS) offer unprecedented opportunities for sensitive chemical, biological, and physical measurements. I will describe three specific applications of NEMS that we are c ... More ...
Monday, 18.10.2004 HS1, Institute of Physics Time: 16:00h	Nanotribology of alkali halide surfaces: From atomic-scale abrasive wear to superlubricity Dr. Enrico Gnecco Due to their simple structure and the weak interaction with the probing tip, ionic crystals are ideal systems for studying nanoscale phenomena by atomic force microscopy in ultra-high vacuum. In my talk I will discuss fundamental friction and wear processes observed on KBr and NaCl. At extremely lo ... More ...
Monday, 18.10.2004 HS1, Institute of Physics Time: 16:25h	Supramolecular Patterned Surfaces Driven by Cooperative Assembly of C60 and Porphyrins on Metal Substrates Dr. Hannes Spillmann The unique electronic, electrochemical and photophysical properties of porphyrins and C60 have been widely explored in the context of molecular device materials (OLED, TFT) and also - more fundamental - in the context of molecular electronics. In this work we report on a new way of cooperative supr ... More ...
Monday, 25.10.2004 HS1, Institute of Physics Time: 16:00h	Low noise and high speed scanning force microscopy with small cantilevers Dr. Bart Hoogenboom An ideal scanning force microscope (SFM) would allow high-speed atomic resolution imaging, simultaneous measurement of vertical and lateral forces on the atomic scale, and the distinction of various energy loss mechanisms, while it would still be easy to operate in environments as divers as ultra-hi ... More ...
Monday, 25.10.2004 HS1, Institute of Physics Time: 16:25h	Adsorption and interaction on NTCDA molecules on Ag(110) surface: insights from first principles calculations Audrius Alkauskas We study adsorption of the NTCDA molecule, a prototype organic semiconductor, on the Ag(110) surface by means of large-scale density functional calculations. We find that bonding is highly site-specific due to ability of anhydride oxygen side groups to form bonds with the underlying silver substrate ... More ...
Monday, 1.11.2004 HS1, Institute of Physics Time: 16:00h	Morphology of intermediate filaments (IFs) adsorbed to solid supports – another way to unveil IFs architecture Dr. Laurent Kreplak In a previous atomic force microscopy (AFM) study, we have shown that vimentin intermediate filaments could be vizualised under buffer conditions after adsorption to various supports (Mücke N., Kreplak K. et al., (2004): Assessing the Flexibility of Intermediate Filaments by Atomic Force Microscopy. ... More ...
Monday, 8.11.2004 HS1, Institute of Physics Time: 16:00h	Molecules as Tri-state Systems? Theory and Evidence. Bernard Delley Density functional theory offers a coherent picture for the surprising properties of a class of NO compounds with long lived, optically adressable states. The controversies about the nature of these states has brought about a wealth of only loosely connected experimental data. Density functional t ... More ...
Monday, 15.11.2004 HS1, Institute of Physics Time: 16:00h	Monitoring Conformational Diversity in Self-Organised Monolayers with Scanning Tunnelling Microscopy at Near Atomic Resolution Lukas Scherer The direct imaging of species of chemical interest at the molecular and submolecular level using tunneling and force microscopy has revolutionized possibilities for the visualization and control of nanostructured systems.[1] Nano-assemblies have gained a growing interest recently,[2] due to increase ... More ...
Monday, 22.11.2004 HS1, Institute of Physics Time: 16:00h	Building, Manipulating, and Interrogating Biomolecules at the Surface at Nanoscale Dimensions Ashutosh Chilkoti I will present three examples of work of my laboratory at the Nano-Bio interface. In the first example, I will present new methods to pattern proteins and biopolymers at the nanoscale by new variants of dip-pen nanolithography (DPN). The fabrication of stimulus-responsive nanoscale arrays of a gene ... More ...
Monday, 29.11.2004 HS1, Institute of Physics Time: 16:00h	Doing Things Better: Ethical Implications of Nanotechnological Research Prof. Dr. Christoph Rehmann-Sutter The current debate about nanotechnology depends heavily on powerful images like self-replicating nanobots getting loose and doing damage, anti-aging devices or so-called post-humans. While necessary for an inspired and critical debate about what "the better" might be (and what not), such images can ... More ...
Monday, 6.12.2004 HS1, Institute of Physics Time: 16:00h	Planar sample holder for in situ experiments in cell biology Maurizio Gullo Channel proteins are responsible for a variety of elementary cell functions. Consequently, there is a great interest in understanding the transport mechanism through these channels. Patch clamp technique provides insight into the electrical behavior of an ensemble of such proteins. This method uses ... More ...
Monday, 13.12.2004 HS1, Institute of Physics Time: 16:15h	A virtual nc-AFM with PLL-controlled frequency detection and excitation: addressing the problem of apparent damping Dr. Laurent Nony This talk will deal with the implementation of a virtual microscope operating in non-contact mode (nc-AFM). The Labview™ implementation closely mimics the real setup used for UHV experiments consisting in a mix of digital and analog devices. The components are grouped into the following blocks: 1) a ... More ...
Monday, 13.12.2004 HS1, Institute of Physics Time: 16:40h	Ordered molecular assemblies confined on a nanostructured insulator: an atomic force microscopy investigation Lars Zimmerli The adsorption of functional organic molecules on surfaces offers fascinating perspectives for novel nanometer-sized electronic devices. Nevertheless, their feasibility lies on the hope that molecules can be confined between metallic electrodes with similar dimensions, electrically decoupled from th ... More ...
Monday, 20.12.2004 HS1, Institute of Physics Time: 16:15h	From Nature to Materials: Towards Nanostructured Organic-inorganic Materials by adapting Design Strategies from Biomineralization Dr. Andreas Taubert Living organisms can control the formation of inorganics like calcium phosphate, calcium oxalate, iron oxide, or iron sulfide via organic growth modifiers such as peptides or proteins. The resulting materials are highly structured, hierarchically ordered organic-inorganic nanocomposites. They have a ... More ...
Monday, 10.1.2005 HS1, Institute of Physics Time: 16:15h	Key-Lock Copolymers Dr. Corinne Vebert Polymers are particularly well suited for implementing different functionalities on the same molecule. We describe here the design of novel self-assembling polymeric systems based on specific and non covalent key-lock interactions. For example, hydrophilic PEO and hydrophobic PDMS or PB chains, be ... More ...
Monday, 10.1.2005 HS1, Institute of Physics Time: 16:40h	VirE2 mechanics and single-molecule fluorescence detection investigated by optical tweezers Dr. Wilfried Grange We highlight recent experiments performed in our lab using a state of the art optical tweezers (OT) instrument, which - in addition to the determination of minute forces - allows confocal fluorescence detection. VirE2 mechanics. Agrobacterium tumefaciens (AT) has the unique ability to genetically t ... More ...
Monday, 17.1.2005 HS1, Institute of Physics Time: 16:15h	Nanotube and molecular quantum dots Prof. Dr. Herre van der Zant Quantum dots (QDs) formed in two-dimensional electron gases have been intensively studied for the last decade. More recently, quantum dots made of carbon nanotubes and individual molecules have been the subject of intensive research. A continuous improvement in device fabrication and single-wall na ... More ...
Monday, 24.1.2005 HS1, Institute of Physics Time: 16:15h	Optical manipulation of quantum dot spins Prof. Dr. Atac Imamoglu A single quantum dot with an excess conduction band electron is an ideal system to study quantum optical phenomena in semiconductors. In this talk, I will describe progress in our theoretical and experimental work aimed at all optical electron-spin measurement and entanglement. I will also discuss h ... More ...
Monday, 31.1.2005 Institut für Physik, Lecture Hall 1 Time: 17:30h	PHYSICS COLLOQUIUM in honour of Prof. Peter Oelhafen «Photoemission at high pressures» Prof. Robert Schlögl
Monday, 7.2.2005 HS1, Institute of Physics Time: 16:15h	On the Birth of a Super Molecule Dr. Hans Eisler Tailoring the light-matter interaction at the nano scale, is one of the most fascinating and active research fields of current solid state physics, chemistry and materials science. This activity is mainly driven by the vision on generating, manipulating and directing the flow of photons as the carri ... More ...

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