Sökning: "NATURVETENSKAP Fysik Kondenserade materiens fysik Elektronstruktur"

Visar resultat 6 - 10 av 32 avhandlingar innehållade orden NATURVETENSKAP Fysik Kondenserade materiens fysik Elektronstruktur.

  1. 6. Effects of Spin-Orbit Interactions in Ferromagnetic Metal Nanoparticles

    Författare :Aleksander Cehovin; Matematisk fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; electrical; magnetic and optical properties; elementary spin excitations; spektroskopi; magnetisk resonans; supraledare; electron tunneling spectroscopy; Condensed matter:electronic structure; magnetic anisotropy; spin-orbit interactions; magnetism in nanostructures; egenskaper elektriska; ferromagnetic materials; magnetiska och optiska ; Kondenserade materiens egenskaper:elektronstruktur; relaxation; spectroscopy; supraconductors; magnetic resonance; Fysicumarkivet A:2003:Cehovin;

    Sammanfattning : This thesis is a theoretical investigation of the effects of spin-orbit (SO) interactions in ferromagnetic metal nano-particles. Part I of the thesis is devoted to an elementary introduction of the research field, including recent experimental advances which partly motivated the work presented here. LÄS MER

  3. 7. Static and Dynamic Correlation Effects in Atoms

    Författare :Nils-Erik Dahlen; Matematisk fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; magnetic and optical properties; electrical; Condensed matter:electronic structure; relaxation; magnetic resonance; supraconductors; spectroscopy; Kondenserade materiens egenskaper:elektronstruktur; Atom- och molekylärfysik; Atomic and molecular physics; spektroskopi; magnetisk resonans; egenskaper elektriska; supraledare; magnetiska och optiska ; variational energies; double ionization; Electron correlation; laser-atom interaction; Fysicumarkivet A:2002:Dahlen; conserving approximations; Green s functions; GW-approximation;

    Sammanfattning : The thesis considers the effects of electron correlation by studying the two opposite limits of atoms in the ground state and atoms in strong laser pulses. Computational methods and theoretical approaches differ significantly due to the different physical processes that are studied in these two cases. LÄS MER

  4. 8. Electronic, Transport, and Optical Properties of Broken-Gap Heterostructures

    Författare :Karin Nilsson; Matematisk fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; relaxation; magnetic resonance; supraconductors; magnetic and optical properties; k.p calculations; Condensed matter:electronic structure; electrical; interband transport; electron-hole hybridization; spin polarization; spectroscopy; spektroskopi; Kondenserade materiens egenskaper:elektronstruktur; egenskaper elektriska; magnetiska och optiska ; supraledare; magnetisk resonans;

    Sammanfattning : This thesis examines the physical properties of broken-gap heterostructures using a multiband k.p model and self-consistent calculations. Broken-gap heterostructures, made from InAs, GaSb, and AlSb, are characterized by a special band alignment with an overlap between the InAs conduction band and the GaSb valence band. LÄS MER

  5. 9. Sigma-delta based techniques for future multi-standard wireless radios

    Författare :Steffen Albrecht; Mohammed Ismail Elnaggar; Franz Dielacher; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Electronic structure; Elektronstruktur;

    Sammanfattning : Improvements in process technology and design innovations have resulted in compact and cost effective digital baseband solutions. The radio part, however, has remained a bottleneck in terms of chip area and power consumption as the feature size of analog devices does not directly benefit from scaling. LÄS MER

  7. 10. System-on-package solutions for multi-band RF front end

    Författare :Xinzhong Duo; Li-Rong Zheng; Kari Halonen; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; chip-package co-design; multi-band radio; system-on-package; Electronic structure; Elektronstruktur;

    Sammanfattning : Advances in microelectronics technology have enabled us to integrate a complex electronic system (such as a radio) on a single chip or in a single package module, known as system-on-chip (SoC) and system-on-package (SoP) paradigms. This brings not only new opportunities for system integration, but also challenges in design and implementation. LÄS MER