Sökning: "quantum many-body theory"

Visar resultat 6 - 9 av 9 uppsatser innehållade orden quantum many-body theory.

  1. 6. Charge transport in a Hubbard-Holstein junction: Preliminary results from a DFT approach.

    Kandidat-uppsats, Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Författare :Eric Ceccarelli; [2019]
    Nyckelord :Density functional theory; DFT; Hubbard-Holstein; Hubbard-Holstein model; HH; Quantum transport; Physics and Astronomy;

    Sammanfattning : Many-body systems are extremely complicated to describe due to mutual interactions between the constituent particles. This is for example the case of systems with electron-electron (e-e) and electron-phonon (e-ph) interactions. LÄS MER

  3. 7. Near-local density approximation approach to one-dimensional lattice systems

    Kandidat-uppsats, Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Författare :Basheer Joudeh; [2018]
    Nyckelord :DFT; Hartree; Hartree-Fock; LDA; BALDA; Mean-field; Hubbard; SOFT; Physics and Astronomy;

    Sammanfattning : Describing many-body quantum systems has been an analytically and computationally challenging task since the advent of quantum mechanics. However, in the past 50 years as a result of our technological advancement and the emergence of methods such as density-functional theory (DFT), we have taken crucial steps forward regarding our ability to study and understand large quantum systems. LÄS MER

  4. 8. Investigating the GW self-energy of the homogeneous electron gas in real space

    Master-uppsats, Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Författare :Zhen Zhao; [2018]
    Nyckelord :GW method; self energy; screened-exchange; Coulomb-hole; Physics and Astronomy;

    Sammanfattning : The real space behavior of the GW self-energy in the electron gas model was investigated in this thesis work. The self-energy is naturally decomposed into the screened-exchange and the Coulomb-hole components. LÄS MER

  5. 9. Non-equilibrium dynamics ofa single spin in a tunnel junction

    Uppsats för yrkesexamina på avancerad nivå, Materialteori

    Författare :Henning Hammar; [2014]
    Nyckelord :molecular electronics; spintronics; solid state theory; spin system; quantum computers;

    Sammanfattning : Making spintronic devices is a hot topic for future technical development. In this work the non-equilibrium dynamics of a single spin in a tunnel junction is analyzed and numerically simulated. This is done in order to understand the dynamics of e.g. LÄS MER