Sökning: "dark matter theory"

Visar resultat 16 - 20 av 37 avhandlingar innehållade orden dark matter theory.

  1. 16. Microscopic Theory of Exciton Dynamics in Two-Dimensional Materials

    Författare :Samuel Brem; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; exciton-phonon interaction; van der Waals materials; relaxation dynamics; excitons; 2D materials; density matrix formalism;

    Sammanfattning : Transition Metal Dichalcogenides (TMDs) present a giant leap forward towards the realization of nanometer-sized quantum devices. As a direct consequence of their truly two-dimensional character, TMDs exhibit a strong Coulomb-interaction, leading to the formation of stable electron-hole pairs, so-called excitons. LÄS MER

  3. 17. Microscopic Theory of Charge Complexes in Atomically-Thin Materials

    Författare :Raul Perea Causin; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; phonons; trions; dynamics; propa- gation; excitons; many-body physics; dissociation; photoluminescence; 2D materials;

    Sammanfattning : Atomically-thin materials have emerged as the most promising two-dimensional platform for future optoelectronic applications and for the study of quantum many-body physics. In particular, transition metal dichalcogenides (TMDs) exhibit strong Coulomb interaction, resulting in the formation of tightly-bound electron-hole complexes that dominate optics, dynamics, and transport. LÄS MER

  4. 18. Microscopic modelling of exciton-exciton interactions in atomically thin semiconductors

    Författare :Daniel Erkensten; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; transition-metal dichalcogenides; dark excitons; density matrix formalism; exciton-exciton interactions;

    Sammanfattning : The successful isolation and characterization of the technologically promising material graphene in 2004 has spurred huge interest in other two-dimensional materials. Transition-metal dichalcogenides (TMDs), being one such class of materials, display intriguing properties from both a fundamental and techno- logical point of view. LÄS MER

  5. 19. Fluorescence Studies of Membranes -- Proteins and Lipids, their Dynamics and Interactions

    Författare :Johan Strömqvist; Jerker Widengren; Thorsten Wohland; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fluorescence correlation spectroscopy; cytokinesis; collision theory; protein-protein interactions; lipid dynamics; single-molecule experiment; Biological physics; Biologisk fysik;

    Sammanfattning : In this thesis, fluorescence spectroscopy was utilized to probe protein and lipid dynamics and interactions in their native, or close to native, environments. Thereby insight could be gained into the fundamentals of bacterial cell division and the innateimmune system. A particular focus has been devoted to fluorescence fluctuations. LÄS MER

  7. 20. WIMP searches in an Effective Field Theory Framework from XENON1T to XENONnT

    Författare :Vasile Cristian Antochi; Conrad Jan; Alfredo Davide Ferella; Samuel Silverstein; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; WIMP; Dark Matter; EFT; Chiral EFT; Direct Detection; PMT testing; fysik; Physics;

    Sammanfattning : Observations from cosmology and astronomy suggest that most of the matter in the Universe is comprised of dark matter. In this thesis the evidence for dark matter and the possible candidates are explored, focusing on the Weakly Interacting Massive Particles (WIMPs) hypothesis. LÄS MER