Sökning: "Emil Johansson"

Visar resultat 6 - 9 av 9 avhandlingar innehållade orden Emil Johansson.

  1. 6. Geometry, Topology and Emergence in Moiré Systems

    Författare :Ahmed Abouelkomsan; Emil Johansson Bergholtz; Felix von Oppen; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Moiré materials; Topological phases; Fractional Chern insulators; Quantum geometry; Quantum Hall effects; Theoretical Physics; teoretisk fysik;

    Sammanfattning : The experimental discovery of correlated insulators and superconductivity in highly tunable Van der Waals heterostructures, such as twisted bilayer graphene, has highlighted the role of moiré patterns, resulting from tiny relative twists or lattice constant mismatches, in realizing strongly correlated physics. A key ingredient is the existence of very narrow flat bands where interaction effects are dominant. LÄS MER

  3. 7. Resource management for network-assisted D2D communication

    Författare :Demia Della Penda; Mikael Johansson; Emil Björnson; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : During the last decade, the widespread use of smart devices and mobile applications has led to a massive growth of the mobile traffic demand. Efficiency and scalability are therefore key criteria for the development of future cellular systems, in which device-to-device (D2D) communication is recognized as one of the promising technologies. LÄS MER

  4. 8. Power Control for Multi-Cell Massive MIMO

    Författare :Amin Ghazanfari; Emil Björnson; Erik G. Larsson; Mikael Johansson; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : The cellular network operators have witnessed significant growth in data traffic in the past few decades. This growth occurs due to the increases in the number of connected mobile devices, and further, the emerging mobile applications developed for rendering video-based on-demand services. LÄS MER

  5. 9. Knots and Transport in Topological Matter

    Författare :Marcus Stålhammar; Emil Johansson Bergholtz; Christiane Morais Smith; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Transport; Knots; Topology; non-Hermiticity; Weyl semimetals; Theoretical Physics; teoretisk fysik;

    Sammanfattning : Topology has manifestations in physics ranging from the field of condensed matter to photonics. This dissertation provides a two-fold study on the impact of topology in Hermitian and non-Hermitian band structures. LÄS MER