Sökning: "ising"

Visar resultat 11 - 15 av 27 uppsatser innehållade ordet ising.

  1. 11. Properties of cluster-size heterogeneity near the phase transition in the two-dimensional Ising model

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

    Författare :Renée Kauppi; [2020]
    Nyckelord :Ising model; Cluster-size heterogeneity; Phase transition;

    Sammanfattning : Two different definitions of cluster-size heterogeneity are investigated as well as correlation time of different quantities using the Metropolis algorithm and the Wolff algorithm. It is confirmed that the correlation time multiplied by the computation time is lower for the Wolff algorithm in an area around the critical temperature. LÄS MER

  3. 12. Ensemble Green's Function Theory for Interacting Electrons with Degenerate Ground States

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

    Författare :Erik Linnér; [2019]
    Nyckelord :Green s function; Degeneracy; Density matrix; Ensemble; GW; Zero-temperature; Finite-temperature; Hubbard model; Two-dimensional harmonic oscillator; Ising model; Hydrogen-like model; Physics and Astronomy;

    Sammanfattning : An ensemble Green's function theory for many-electron systems with degenerate ground states, based on the von Neumann density matrix formalism, is proposed. The formalism is constructed without an assumption of an adiabatic connection. An ensemble analogue of Hedin's equations and the GW Approximation (GWA) is constructed. LÄS MER

  4. 13. Quantum Criticality in the Transverse Field Random Ising Model

    Master-uppsats, KTH/Fysik

    Författare :Kristoffer Aronsen; [2019]
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  5. 14. Continuous-variable quantum annealing with superconducting circuits

    Master-uppsats, Linköpings universitet/Institutionen för fysik, kemi och biologi

    Författare :Pontus Vikstål; [2018]
    Nyckelord :quantum annealing; adiabatic quantum computing; continuous variables; coherent states; Wigner function; superconducting circuits; Kerr-nonlinear resonator.;

    Sammanfattning : Quantum annealing is expected to be a powerful generic algorithm for solving hard combinatorial optimization problems faster than classical computers. Finding the solution to a combinatorial optimization problem is equivalent to finding the ground state of an Ising Hamiltonian. LÄS MER

  7. 15. Sequence Correlations in HP Model Proteins

    Kandidat-uppsats, Lunds universitet/Beräkningsbiologi och biologisk fysik - Genomgår omorganisation; Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation

    Författare :Orestes Theodoridis; [2018]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : Amino acids that are in close contact in a protein structure tend to co-evolve, which gives rise to sequence correlations. Direct coupling analysis (DCA) is a method for predicting such contacts directly from sequence correlations, without assuming any prior knowledge of structures. LÄS MER