Search for dissertations about: "Holstein model"

Showing result 1 - 5 of 9 swedish dissertations containing the words Holstein model.

  2. 1. Cultural Competence for Health Professionals : Instrument Development

    Author : Jane Holstein; Anette Kjellberg; Gunilla Liedberg; Ulrika Bejerholm; Margareta Bachrach-Lindström; Linköpings universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; self-assessment; occupational therapy; ethnic groups; cultural competency; health personnel; qualitative research; psychometrics;

    Abstract : In recent decades, both global migration in general and specifically migration to Sweden have increased. This development compels the need for delivering healthcare to the increasingly diverse populations in Sweden. READ MORE

  4. 2. A Theoretical Study of Charge Transport in Molecular Crystals

    Author : Elham Mozafari; Sven Stafström; Magnus Johansson; Linköpings universitet; []
    Keywords : Molecular Crystals; Charge transport; Polaron; Holstein model; Peierls coupling;

    Abstract : The main objective of this thesis is to provide a deeper understanding of the charge transport phenomena occuring in molecular crystals. The focus is on the stability and the dynamics of the polaron as the charge carrier.To achieve this goal, a series of numerical calculations are performed using the semi-emprical "Holstien-Peierls" model. READ MORE

  5. 3. Theoretical studies of lattice- and spin-polarons

    Author : Nina Bondarenko; Olle Eriksson; Natalia Skorodumova; Manuel Pereiro; Maria Roser Valenti Vall; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Polaron; Nonlinear Schrödinger Equation; Nonlocality; Solitons; Integrable systems; Quantum field theory low energy ; Electron-phonon interaction; Density functional theory; Electronic structure of atoms and molecules; Spin-polaron; Langevin equation; Transport properties; Hubbard model; Heisenberg lattice; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Abstract : Theoretical studies of lattice- and spin-polarons are presented in this thesis, where the primary tool is ab-initio electronic structure calculations. The studies are performed with employment of a variety of analytical and computational methods. READ MORE

  6. 4. Electron-Lattice Dynamics in pi-Conjugated Systems

    Author : Magnus Hultell (Andersson); Sven Stafström; Alexander Onipko; Linköpings universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Polaron dynamics; Exciton dynamics; pi-conjugated systems; Su-Schrieffer-Heeger SSH model; Adiabaticity; Charge carrier transport; Organic electronics.; Computational physics; Beräkningsfysik;

    Abstract : In this thesis we explore in particular the dynamics of a special type of quasi-particle in pi-conjugated materials termed polaron, the origin of which is intimately related to the strong interactions between the electronic and the vibrational degrees of freedom within these systems. In order to conduct such studies with the particular focus of each appended paper, we simultaneously solve the time-dependent Schrödinger equation and the lattice equation of motion with a three-dimensional extension of the famous Su-Schrieffer-Heeger (SSH) model Hamiltonian. READ MORE

  7. 5. Crossbreeding as a strategy in dairy cattle herds

    Author : Julie Clasen; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Abstract : This thesis aimed to explore benefits of dairy crossbreeding at herd level and form recommendations for dairy farmers, advisors, and breeding companies. A survey study revealed that Swedish dairy farmers can be divided into two groups: those supporting crossbreeding and those not supporting it. READ MORE