Sökning: "quantum resonances"

Visar resultat 31 - 35 av 50 avhandlingar innehållade orden quantum resonances.

  1. 31. Optical properties of active photonic materials

    Författare :Yong Zeng; Ying Fu; Philip Russell; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; nanophotonics; plasmonics; Theoretical chemistry; Teoretisk kemi;

    Sammanfattning : Because of the generation of polaritons, which are quasiparticles possessing the characteristics of both photonics and electronics, active photonic materials offer a possible solution to transfer electromagnetic energy below the diffraction limit and further increase the density of photonic integrated circuits. A theoretical investigation of these exciting materials is, therefore, very important for practical applications. LÄS MER

  3. 32. Adiabatic Andreev Levels Under Irradiation - Coherent Dynamics and Dephasing

    Författare :Niklas I:son Lundin; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : A study of the Andreev level current through a weakly voltage-biased single-mode superconducting quantum point contact under microwave irradiation is presented. The applied microwave field induces resonant transitions between the current carrying Andreev states localized to the contact region, which results in an increase of the dc subgap current by several orders of magnitude. LÄS MER

  4. 33. Feasibility study of resonant antiproton capture by ions and an open system approach to resonance decay

    Författare :Michael Genkin; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Atomic physics; Atomfysik;

    Sammanfattning : The present thesis is based on two different projects. The first part deals withresonant capture of antiprotons by electron excitation in highly charged hydrogenlike ions. LÄS MER

  5. 34. Resonant States in Negative Ions

    Författare :Nicklas Brandefelt; John S. Briggs; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Molekylfysik; Atomfysik; Kärnfysik; Partikelfysik; Atomic and molecular physics; Atom- och molekylfysik;

    Sammanfattning : Resonant states are multiply excited states in atoms and ions that have enough energy to decay by emitting an electron. The ability to emit an electron and the strong electron correlation (which is extra strong in negative ions) makes these states both interesting and challenging from a theoretical point of view. LÄS MER

  7. 35. Laser cooling mechanisms and Brownian motors in optical lattices

    Författare :Peder Sjölund; Anders Kastberg; Svante Jonsell; Chris Westbrook; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Optical physics; Optisk fysik;

    Sammanfattning : Denna avhandling innefattar såväl experimentella som numeriska studier av laserkylda atomer i optiska kristallgitter. Bland annat har laserkylningsprocesser studerats, där atomers rörelser i optiska kristallgitter har uppvisat andra typer av bakomliggande mekanismer än de som tidigare förutsågs genom “Sisyfoskylningsmodellen”. LÄS MER