Sökning: "Strong-field physics"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden Strong-field physics.

  1. 1. Modelling and analyzing strong-field effects in quantum plasma

    Författare :Haidar Al-Naseri; Gert Brodin; Jens Zamanian; J. Tito Mendonca; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Plasma physics; Strong-field physics; Kinetic theory; Quantum plasma; fysik; Physics;

    Sammanfattning : Under the extreme conditions that can be found around dense stars and in the accretion discs of black holes, several strong-field quantum phenomena dominate the dynamics of the plasma. This includes the creation of matter and anti-matter from the vacuum (Schwinger mechanism), radiation reaction and Landau quantization. LÄS MER

  3. 2. Pair production, vacuum birefringence and radiation reaction in strong field QED

    Författare :Greger Torgrimsson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; worldline instantons; lightfront quantisation; radiation reaction; vacuum birefringence; nonperturbative pair production;

    Sammanfattning : In this thesis we consider three QED phenomena in strong electromagnetic fields: Schwinger pair production, vacuum birefringence and radiation reaction. We study electron-positron pair production in a variety of field configurations and, using complex worldline instantons, reveal new insights into the case of fields with lightlike inhomogeneities. LÄS MER

  4. 3. Sub-Cycle Control of Strong-Field Processes on the Attosecond Timescale

    Författare :Stefanos Carlström; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; High-order harmonic generation; Quantum path interference; Coherence; Fysicumarkivet A:2017:Carlström;

    Sammanfattning : This PhD thesis deals with the sub-cycle nature of ultrafast phenomena that occur in strong-field light–matter interactions. As it is of interest to control these phenomena, we must understand them in order to manipulate them. The tools at our disposal are intense laser pulses of short duration, and the systems we study are atoms. LÄS MER

  5. 4. Applications of time-dependent configuration-interaction singles for photoelectrons in attosecond and free-electron laser sciences

    Författare :Mattias Bertolino; Matematisk fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; laser-assisted photoionization; photoelectron interferometry; attosecond physics; free-electron laser; second quantization; time-dependent configuration-interaction singles; surface-flux techniques;

    Sammanfattning : This thesis addresses the theoretical treatment of photoelectrons in attosecond and free-electron laser sciences. Wehave implemented methods that extract information on the photoionization process, which we use to investigateinterferometric schemes with particular focus on multiphoton ionization and strong-field effects in attosecondmetrology and coherent control of photoelectrons in free-electron laser science. LÄS MER

  7. 5. Towards graphene-based devices: Fabrication and characterization

    Författare :Niclas Lindvall; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Synthesis; Chemical vapor deposition; Mechanical cleaning; Aharonov-Bohm effect; Graphene; Ferroelectric; Bolometer;

    Sammanfattning : Graphene is a new material with a large set of impressive properties, interesting both for fundamental studies and applications. Reliable synthesis of large-scale, high-quality graphene is key to its future success. LÄS MER