Sökning: "Majorana"

Visar resultat 16 - 20 av 23 avhandlingar innehållade ordet Majorana.

  1. 16. Deviations from the London model in superconductors

    Författare :Emma Campillo; Synkrotronljusfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Superconductivity; Neutron scattering; SANS; vortex lattice; condensed matter physics; Fysicumarkivet A:2022:Campillo;

    Sammanfattning : Using Small-Angle Neutron Scattering (SANS) we have studied the flux line lattices of the first heavy-fermion superconductor to be discovered, CeCu2Si2, the well-known high-temperature superconductor YBa2Cu3O7, along with Ca-doped variants of this compound, and several topological superconductor candidates that have attracted a lot of attention in the last few years, such as PbTaSe2, Au2Pb and β-Bi2Pd.Unconventional superconductors, with pairing mechanisms and properties that are not accounted for within BCS theory, are a subject of continuing interest. LÄS MER

  3. 17. Topological superconductivity in multiorbital materials

    Författare :Johann Schmidt; Annica M. Black-Schaffer; Karyn Le Hur; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Superconductivity; Kitaev materials; Odd-frequency superconductivity; Topological superconductivity; Fysik; Physics;

    Sammanfattning : Multiorbital materials add a new intricacy to the already complex phenomenon of superconductivity. The additional orbital degree of freedom requires leaving behind the established band picture, but also opens the possibility of more complicated order parameters with new properties. LÄS MER

  4. 18. Aspects of Dimensional Deconstruction and Neutrino Physics

    Författare :Tomas Hällgren; Tommy Ohlsson; Stephan J. Hubber; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Dimensional deconstruction; higher-dimensional gauge theories; discretized gravity; neutrino mass; neutrino mixing; neutrino oscillations; Engineering physics; Teknisk fysik;

    Sammanfattning : The existence of at or curved extra spatial dimensions provides new insights into several of the problems which face the Standard Model of particle physics, including the gauge hierarchy problem, the smallness of neutrino masses, and the dark matter problem. However, higher-dimensional gauge theories are not renormalizable and can only be considered as low-energy effective theories, with limited applicability. LÄS MER

  5. 19. D-instantons and Dualities in String Theory

    Författare :Christoffer Petersson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : In this thesis we study non-perturbative aspects of string theory. We focus our analysis on D-instanton effects which play key roles in the context of dualities, moduli stabilization and phenomenology. LÄS MER

  7. 20. Topological states of matter in low dimensions

    Författare :Christian Spånslätt; Eddy Ardonne; Thors Hans Hansson; Karsten Flensberg; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; teoretisk fysik; Theoretical Physics;

    Sammanfattning : A central theme in condensed matter physics is the classification and characterization of states of matter. In the recent decades, it has become evident that there exists a large class of quantum mechanical systems that must be classified according to properties deeply rooted in the mathematical field of topology, rather than in terms of which symmetries they break. LÄS MER