Sökning: "electron spin resonance"

Visar resultat 6 - 10 av 62 avhandlingar innehållade orden electron spin resonance.

  1. 6. 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

  3. 7. Electron and Spin Transport in Graphene-Based Nanodevices

    Författare :Xiao-Fei LI; Yi Luo; Rajeev Ahuja; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; SRA - Transport; SRA - Transport;

    Sammanfattning : This thesis is devoted to the multi-scale modeling of electron and spin transport in graphene-based nanodevices. Several devices with fascinating structures and attractive properties have been designed by means of state-of-the-art computational methods, which include ab-initio molecular dynamics (MD) simulations for the geometry, density functional theory (DFT) for the electronic structure, and non-equilibrium Green’s functions (NEGF) for carriers transport properties. LÄS MER

  4. 8. Making Radical Cations Live Longer

    Författare :Ola Persson; Kemisk fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; spin trapping.; 3-hexafluoropropan-2-ol; 3; 1; thallium III -based oxidants; Radical cations; electron paramagnetic resonance; Physics; Fysik; Chemistry; Kemi;

    Sammanfattning : The acid-catalyzed rearrangement of 1,4,5,8-tetramethylnaphthalene was used to determine the acidity of media used for EPR spectral studies of radical cations. The radical cations of methyl-substituted naphthalenes were shown to undergo dimerization reactions. LÄS MER

  5. 9. Effects of the Spin-Orbit Interaction on Transport and Optical Properties of III-V Semiconductor Quantum Wells

    Författare :Vladimir Froltsov; Matematisk fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; spin-orbit interaction; quantum well; III-V; Raman scattering; magnetoresistance; weak localization; spin distribution; magnetic field; Fysik; Physics; Fysicumarkivet A:2000:Froltsov; Halvledarfysik; Semiconductory physics; semiconductor;

    Sammanfattning : Effects of the intrinsic electron spin-orbit interaction on transport and optical properties of III-V semiconductor quantum wells have been studied theoretically. It is shown that due to crystal anisotropy of this interaction, the weak localization magnetoresistance in a magnetic field parallel to interfaces is very sensitive to the epitaxy growth direction and also to the orientation of the magnetic field with respect to the crystal axes. LÄS MER

  7. 10. Theoretical studies of EPR parameters of spin-labels incomplex environments

    Författare :Bogdan Frecus; Hans Ågren; Chiara Cappelli; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; EPR; DFT; spin-labels; QM MM; Breit-Pauli Hamiltonian;

    Sammanfattning : This thesis encloses quantum chemical calculations performed in the framework of density functional response theory for evaluating electron paramagnetic resonance (EPR) spin Hamiltonian parameters of various spin-labels in different environments. These parameters are the well known electronic g-tensor and the nitrogen hyperfine coupling constants, which are extensively explored in this work for various systems. LÄS MER