Sökning: "Spin chains"

Visar resultat 1 - 5 av 10 uppsatser innehållade orden Spin chains.

  1. 1. Crosscap States in Integrable Spin Chains

    Master-uppsats, KTH/Fysik

    Författare :Christopher Ekman; [2022]
    Nyckelord :Theoretical Physics; Mathematical Physics; Integrability; Integrable Systems; Spin chains; Heisenberg model; Integrable Boundary States; Crosscap states; Teoretisk fysik; Matematisk fysik; Integrabilitet; Integrabla system; Spinnkedjor; Heisenbergmodellen; Integrabla gränstillstånd; Crosscaptillstånd;

    Sammanfattning : We consider integrable boundary states in the Heisenberg model. We begin by reviewing the algebraic Bethe Ansatz as well as integrable boundary states in spin chains. Then a new class of integrable states that was introduced last year by Caetano and Komatsu is described and expanded. We call these states the crosscap states. LÄS MER

  2. 2. Folding HP Proteins on a Quantum Annealer

    Master-uppsats, Lunds universitet/Beräkningsbiologi och biologisk fysik

    Författare :Lucas Knuthson; [2022]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : Quantum annealing provides a promising avenue for obtaining good approximate solutions to difficult optimization problems. Protein folding represents one such problem. For testing novel algorithms and technologies, simplified lattice models are well suited, as they represent considerable computational challenges despite their simplicity. LÄS MER

  3. 3. Exact eigenstates of the Inozemtsev spin chain

    Master-uppsats, KTH/Fysik

    Författare :Simon Lentz; [2021]
    Nyckelord :Theoretical physics; Mathematical physics; quantum mechanics; many-body problems; spin chain; Inozemtsev; Calogero-Sutherland; Teoretisk fysik; Matematisk fysik; kvantmekanik; mångpartikel problem; spinnkedjor; Inozemtsev; Calogero-Sutherland;

    Sammanfattning : This thesis deals with the following question: are there more eigenfunctions, other than the already known eigenfunctions, of the spin chain with elliptic interactions known as the Inozemtsev spin chain? The Inozemtsev spin chain interpolates between two quantum integrable spin chains, theHeisenberg spin chain and the Haldane-Shastry spin chain. Therefore it is interesting to explore eigenfunctions of the Inozemtsev spin chain in greater detail. LÄS MER

  4. 4. Phase Diagrams of Finite Spin Chains with Coupled Spin and Lattice Vibrations

    Kandidat-uppsats, Uppsala universitet/Materialteori

    Författare :Siri Alva Berge; [2021]
    Nyckelord :spin-lattice coupling; spin-vibration coupling; Heisenberg exchange; magnetism;

    Sammanfattning : The spin-lattice coupling is due to itinerant electrons interacting with both spins of ions and phonons, mediating a coupling between magnetic spin moments and lattice vibrations. In this project, the coupling is studied systematically for finite quantum spin chains of size 2 – 10. LÄS MER

  5. 5. Oxidation of cellulose to favour its dissolution in alkaline aqueous solution before regeneration into textile yarn

    Master-uppsats, KTH/Kemiteknik

    Författare :Martin Orpiszak; [2021]
    Nyckelord :Cellulose; periodate oxidation; dissolution; regeneration; textile yarn; cellulosa; natriumperjodat oxidation; upplösning; regenerering; textilgarn;

    Sammanfattning : Detta examensarbete är en del av CelluFil-projektet och syftar till att optimera förhållandena för upplösning av cellulosa i vattenlösning av natriumhydroxid följd av regenering i form av ett garn. Tidigare arbeten har visa tatt cellulosa kan lösas i vattenlösning vid -10°C, men sådana förhållanden är inte tillämpliga i industriell skala. LÄS MER