Search for dissertations about: "Wigner"

Showing result 1 - 5 of 30 swedish dissertations containing the word Wigner.

  1. 1. Quantum Force in Wigner Space

    Author : Huaqing Li; Göteborgs universitet; Göteborgs universitet; Gothenburg University; []
    Keywords : ;

    Abstract : In this thesis, I will present effective methods to study quantum dynamics using trajec- tories. Our methods are based on a method named the Classical Wigner model which starts with a quantum initial condition and generates trajectories which are propagated in time using a classical force. READ MORE

  2. 2. Quantum dynamical effects in complex chemical systems

    Author : S. Karl-Mikael Svensson; Göteborgs universitet; Göteborgs universitet; Gothenburg University; []
    Keywords : NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; NATURAL SCIENCES; Quantum dynamics; Radiative association; Classical Wigner method; Feynman path integral; Reaction rate constants; Wigner phase space;

    Abstract : When using mathematical models to computationally investigate a chemical system it is important that the methods used are accurate enough to account for the relevant properties of the system and at the same time simple enough to be computationally affordable. This thesis presents research that so far has resulted in three published papers and one unpublished manuscript. READ MORE

  3. 3. Classical Wigner Method with an Effective Quantum Force

    Author : Huaqing Li; Göteborgs universitet; Göteborgs universitet; Gothenburg University; []
    Keywords : ;

    Abstract : In this work, I will present an effective way to study the dynamics in phase space and obtain the rate constants. Our method is based on the Classical Wigner (CW) model, which is an approximate method for including quantum mechanical effects into molecular simulations. READ MORE

  4. 4. Interaction effects in the transport of particles in nanowire quantum dots

    Author : Liney Halla Kristinsdottir; Matematisk fysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Wigner localization; atom transport; electron transport; ultracold dipolar gases; Quantum dots; semiconductor nanowires; current blockade; thermopower; Fysicumarkivet A:2015:Kristinsdottir;

    Abstract : Interactions between physical bodies constantly affect their properties. This thesis presents a theoretical study on the effects of interaction in few-body nanowire quantum dots. READ MORE

  5. 5. Quantum Few-Body Physics with the Configuration Interaction Approach: Method Development and Application to Physical Systems

    Author : Jonas Cremon; Matematisk fysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Tonks-Girardeau gas; vortices; Bose-Einstein condensation; quantum many-particle physics; quantum few-particle physics; Lee-Suzuki approximation; configuration interaction method; Wigner localization; quantum dots; ultra-cold gases; Fysicumarkivet A:2010:Cremon;

    Abstract : This dissertation, based on six included papers, theoretically investigates properties of quantum few-particle systems. An overview of related experimental research - ultra-cold trapped dilute gases, and electrons in quantum dots - is given, followed by a description of some of the studied many-particle phenomena - Bose-Einstein condensation, quantized vortices, Wigner localization and the Tonks-Girardeau gas. READ MORE