Browsing Fakultät für Physik (inkl. GAUSS) by Referee "Schönhammer, Kurt Prof. Dr."
Now showing items 1-17 of 17
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Scale-free Fluctuations in in Bose-Einstein Condensates, Quantum Dots and Music Rhythms
(2010-05-25)Mesoscopic systems are prone to substantial fluctuations that typically can not be neglected or avoided. The understanding of the origin and the consequences of these fluctuations (e.g.~for ... -
Scanning Tunnelling Spectroscopy of Subsurface Magnetic Atoms in Copper
(2009-04-08)This thesis describes a study of subsurface magnetic impurities using low-temperature scanning tunnelling spectroscopy. Single Cobalt and Iron impurities have been prepared up to 15 ML below ... -
Parametric Bose-Hubbard Hamiltonians: Quantum Dissipation, Irreversibility, and Pumping
(2008-09-11)In this thesis, we study interacting bosons on lattices consisting of a few sites. The main focus is on their response to external driving fields, their transport and decay properties. We ... -
Atomic Scale Images of Acceptors in III-V Semiconductors
(2008-04-04)This thesis reports measurements of single dopant atoms in III-V semiconduc-tors with low temperature Scanning Tunneling Microscopy (STM) and Scanning Tunneling Spectroscopy (STS). It ... -
AdS/CFT Holography of the O(N)-symmetric $\phi^4$ Vector Model
(2008-01-10)We study the AdS/CFT correspondence at the example of the renormalization group IR and UV fixpoint theories of a Euclidean O(N)-symmetric vector field theory with $(\underline \phi^2)^2$ interaction in 2 dimensions. These ... -
Arrival and Passage Times From a Spin-Boson Detector Model
(2007-07-04)The aim of the present thesis is twofold: On one hand it considers the treatment of time observables in quantum mechanics. In particular, it is concerned with the application of a particular ... -
Effects of Atom-Laser Interaction on Ultra-Cold Atoms
(2006-05-30)The control and manipulation of the atomic translational and internal degrees of freedom via atom-laser interaction is an essential tool in modern quantum optical experiments which allows ... -
Arrival times in quantum mechanics: Operational and quantum optical approaches
(2005-07-29)The theoretical analysis of time observables in quantum mechanics has been controversial and is still subject to debate. In the present work, a measurement-based approach to quantum arrival ... -
Scanning Tunnelling Microscopy of Co-impurified Noble Metal Surfaces: Kondo-Effect, Electronic Surface States and Diffusive Atom Transport
(2004-11-12)The scanning tunnelling microscope (STM) was used to investigate the properties of nanoscale structures on (111)-oriented Ag and Cu films. The special focus is on their electronic states ... -
Materie-Optik mit Edelgasmolekülen an Nanostrukturen
(2004-01-26)The advance of matter optics, thus the coherent scattering of an atom or molecule beam from a nanostructured grating, recently gave conclusive evidence for the extremely weakly bound diatomic ... -
Open Mesoscopic Systems: beyond the Random Matrix Theory
(2003-08-19)Physical systems having sizes between microscopic and macroscopic are referred to as mesoscopic. The motion in mesoscopic systems is phase-coherent, that means they must be treated ... -
Diffraction of Metastable Rare-Gas Atoms from Nanostructured Transmission Gratings
(2003-05-14)Rare-gas atoms are diffracted from nanostructured silicon nitride transmission gratings. From the relative intensities of the diffraction maxima the strength of the van der Waals potential ... -
Transport in Hamilton-Systemen: Von der Klassik zur Quantenmechanik
(2002-04-24)This thesis deals with classical and quantum mechanical transport properties of low dimensional Hamiltonian systems that possess a mixed phase space. It is demonstrated that even in ideal ... -
Renormalization-Group Theory for Quantum Dissipative Systems in Nonequilibrium
(2002-03-21)We apply the recently developed real-time renormalization-group (RTRG) method to different quantum dissipative systems. In contrast to other renormalization-group techniques the RTRG approach ... -
Raster-Thermospannungs-Mikroskopie der Interferenz von Elektronenwellen auf der Au(111)-Oberfläche
(2002-02-18)The interference pattern of scattered electron waves is studied for the 2D-electron gas of the Au(111)-surface. For this purpose, the local thermovoltage across the tunneling junction of ... -
Quantenmechanik zwischen Regularität und Chaos
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Singularities and Pseudogaps in the Density of States of the Fluctuating Gap Model
(2000-08-29)We review the one-dimensional fluctuating gap model (FGM) which describes non-interacting fermions subject to a static random backscattering potential. The FGM applies to the low-energy behavior of quasi one-dimensional ...