Sökning: "Phonon"

Visar resultat 1 - 5 av 173 avhandlingar innehållade ordet Phonon.

  1. 1. Quantum acoustics with propagating phonons

    Författare :Maria Ekström; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; phonon router; unidirectional transducer; phonon; Electromagnetically Induced Transparency; Surface acoustic wave; artificial atom; interdigital transducer; quantum acoustics; qubit; superconducting circuits;

    Sammanfattning : Surface acoustic waves (SAWs) are mechanical vibrations that propagate on the surface of solids while dissipating little power, consequently enabling them to propagate freely over long distances. The speed and wavelength of SAWs are reduced a five order of magnitude compared to when light is used as a carrier at gigahertz frequencies. LÄS MER

  3. 2. Resonant Inelastic X-ray Scattering Studies on Quasi-Two-Dimensional Superconducting Materials

    Författare :Deepak John Mukkattukavil; Jan-Erik Rubensson; Marcus Agåker; Yasmine Sassa; Conny Såthe; Balasubramanian Thiagarajan; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Resonant inelastic x-ray scattering; Superconductivity; Crystal; Magnon; Phonon; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Sammanfattning : Unconventional superconductivity is one of the many fascinating research areas of condensed matter physics. Understanding the superconducting pairing mechanism and its connection with other competing states remains unclear. LÄS MER

  4. 3. Triptych of quantum matter in one dimension : Playful constructions in theoretical and computational physics

    Författare :Axel Gagge; Jonas Larson; Andrew Daley; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Bloch oscillations; Peierls; adiabatic; diabatic; ultracold atoms; Bose-Fermi mixtures; phonon; cQED; superradiance; polarons; DMRG; MPS; Kosterlitz-Thouless; Wannier; Bloch; quantum phase transitions; Theoretical Physics; teoretisk fysik;

    Sammanfattning : In this compilation thesis, three different quantum mechanical systems are presented. All three have in common that they are one-dimensional quantum systems which, each in their own way, can be seen as analogous to other quantum systems. LÄS MER

  5. 4. Materials Design from ab initio Calculations

    Författare :Sa Li; Börje Johansson; Rajeev Ahuja; Gilles Hug; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; DFT; MAX; Optics; phase transition; phonon; EOS; Fysik; Physics; Fysik;

    Sammanfattning : This thesis presents a theoretical study of bulk materials using ab initio methods based on the density functional theory (DFT).Crystallographic structural phase transformations and phase stability for 5f-dioxides, ABO3 perovskites, and ABO4 compounds have been extensively studied. LÄS MER

  7. 5. Experimental Studies of Thermal Diffusivities concerning some Industrially Important Systems

    Författare :Riad Abdul Abas; Seshadri Seetharaman; Rainer Wunderlich; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; laser flash; thermal diffusivity; heat conduction; phonon; electron contribution; crystallisation degree; graphitisation; Metallurgical process engineering; Metallurgisk processteknik;

    Sammanfattning : The main objective of this industrially important work was to gain an increasing understanding of the properties of some industrially important materials such as CMSX-4 nickel base super alloy, 90Ti.6Al.4V alloy, 25Cr:6Ni stainless steel, 0. LÄS MER