Global ETD Search

1	The Approach to Equilibration in Closed Quantum Systems / Equilibrierung von abgeschlossenen Quantensystemen Niemeyer, Hendrik 03 July 2014 (has links) The question whether and how closed quantum systems equilibrate is still debated today. In this thesis a generic spin system is analysed and criteria to classify unique equilibration dynamics are developed. Furthermore, the eigenstate thermalization hypothesis is investigated as a possible cause for the unique equilibrium. For both problems novel numerical methods for solving the time-dependent Schroedinger equation based on series expansions and typicality are developed. Furthermore, the problem of markovian dynamics on the level of single measurements is discussed. Quantenthermodynamik Quantenmechanik Thermodynamik Heisenbergmodell 33.23 - Quantenphysik ddc:530
2	Imaginary-Time Approach to the Kondo Effect out of Equilibrium / Imaginärzeit-Methode zur Beschreibung des Kondo-Effekts im Nichtgleichgewicht Dirks, Andreas 19 June 2012 (has links) No description available. 530 Physik RDI 240 RDI 700 RDI 800 Physics Quantenpunkt Kondo Nichtgleichgewicht Matsubara QMC quantum dot Kondo nonequilibrium Matsubara QMC 33.10 33.28 33.61 33.23 33.06
3	Luttinger-liquid physics in wire and dot geometries / Luttingerflüssigkeitsphysik in Quantendraht- und Quantenpunktgeometrien Wächter, Hans Peter 16 December 2009 (has links) No description available. 530 Physik RDI 200 Mathematics and Natural Science Luttingerflüssigkeit Renormierungsgruppe Nanostrukturen Quantendraht Quantenpunkt Luttinger liquid Renormalization group Nanostructures quantum wire quantum point 33.10 33.23
4	Parametric Bose-Hubbard Hamiltonians: Quantum Dissipation, Irreversibility, and Pumping / Parametrische Bose-Hubbard Hamiltonians: Dissipation, Irreversibilität und Quantenpumpen Hiller, Moritz 19 December 2007 (has links) No description available. 530 Physik Mathematics and Computer Science Bose-Hubbard Hamiltonian Quantenpumpe getriebene Systeme Dissipation Korrespondenzprinzip Bose-Hubbard Hamiltonian quantum pumping driven systems dissipation quantum-classical correspondence 33.23
5	Arrival and Passage Times From a Spin-Boson Detector Model / Ankunfts- und Durchflugszeiten von einem Spin-Boson Detektor-Modell Neumann, Jens Timo 13 February 2007 (has links) No description available. 530 Physik Mathematics and Computer Science Ankunftszeit Durchflugszeit Spin-Boson Detektor-Modell Quantensprung-Methode Mess-Theorie Arrival Time Passage Time Spin-Boson Detector Model Quantum Jump Approach Measurement Theory 33.10 33.23
6	Scanning Tunnelling Spectroscopy of Subsurface Magnetic Atoms in Copper / Electron Focusing and Kondo Effect / Rastertunnelspektroskopie an vergrabenen magnetischen Atomen in Kupfer / Elektronenfokussierung und Kondo-Effekt Weismann, Alexander 09 July 2008 (has links) No description available. 530 Physik Mathematics and Computer Science Rastertunnelspektroskopie Kondo-Effekt Friedel-Oszillationen Elektronenfokussierung Scanning Tunnelling Spectroscopy Kondo Effect Friedel Oscillations Electron Focusing 33.07 33.23 33.68 RVC740
7	Materie-Optik mit Edelgasmolekülen an Nanostrukturen / Matter Optics with Noble Gas Molecules and Nanostructures Stoll, Werner Martin 18 December 2003 (has links) No description available. Mathematics and Computer Science Materie-Optik Few-Body Systems Edelgascluster Helium Spektroskopie 530 Physik Matter Optics Few-Body Systems Noble gas clusters Helium Spectroscopy 33.10 33.30 RDI 240 33.23 RDI 850 33.25 RTE 400 33.30
8	Open Mesoscopic Systems: beyond the Random Matrix Theory / Offene mesoskopische Systeme: über die Zufallsmatrixtheorie hinaus Ossipov, Alexandre 01 April 2003 (has links) No description available. 530 Physik Mathematics and Computer Science Wigner Zeitverzögerung Resonanzen ungeordnete Systeme Quantenchaos Wigner Delay Time Resonances Disordered Systems Quantum Chaos 33.10 33.23 RDI 240: Streutheorie quantenmechanische {Theoretische Physik}
9	Phase diagrams of two-dimensional frustrated spin systems / Phasendiagramme für zweidimensionale frustrierte Spinsysteme Kalz, Ansgar 22 March 2012 (has links) No description available. 530 Physik RDI 800 Physics korreliert magnetisch zweidimensional frustriert Spinmodell Phasenübergang Grundzustand Isingmodell Heisenbergmodell Quantenfluktuation Quadratgitter Honeycombgitter correlated magnetic two-dimensional frustrated spin model Ising Heisenberg ground state phase transition quantum fluctuations square lattice honeycomb lattice 33.10 33.23 33.61 33.64
10	Investigation of the emergence of thermodynamic behavior in closed quantum systems and its relation to standard stochastic descriptions Schmidtke, Daniel 20 August 2018 (has links) Our everyday experiences teach us that any imbalance like temperature gradients, non-uniform particle-densities etc. will approach some equilibrium state if not subjected to any external force. Phenomenological descriptions of these empirical findings reach back to the 19th century where Fourier and Fick presented descriptions of relaxation for macroscopic systems by stochastic approaches. However, one of the main goals of thermodynamics remained the derivation of these phenomenological description from basic microscopic principles. This task has gained much attraction since the foundation of quantum mechanics about 100 years ago. However, up to now no such conclusive derivation is presented. In this dissertation we will investigate whether closed quantum systems may show equilibration, and if so, to what extend such dynamics are in accordance with standard thermodynamic behavior as described by stochastic approaches. To this end we consider i.a. Markovian dynamics, Fokker-Planck and diffusion equations. Furthermore, we consider fluctuation theorems as given e.g. by the Jarzynski relation beyond strict Gibbsian initial states. After all we find indeed good agreement for selected quantum systems. equilibration closed quantum systems stochastic processes 33.23 - Quantenphysik 05.60.Gg - Quantum transport 72.15.Rn - Localization effects ddc:530 ddc:500

Search results