Sökning: "Quantum Phase Transitions"

Visar resultat 21 - 25 av 58 avhandlingar innehållade orden Quantum Phase Transitions.

  1. 21. The Influence of Interlayer Exchange Coupling on Magnetic Ordering in Fe-based Heterostructures

    Författare :Martin Pärnaste; Björgvin Hjörvarsson; Bryan Hickey; Uppsala universitet; []
    Nyckelord :Physics; magnetism; magnetic dimensionality; MOKE; magneto-optics; hydrogen loading; phase transitions; Fysik;

    Sammanfattning : Temperature dependent magnetization measurements were conducted on Fe-based heterostructures. A linear increase of the magnetic critical temperature with increasing Fe thickness was found for Fe/V superlattices with strong interlayer exchange coupling. LÄS MER

  3. 22. Structure formation, phase transitions and drag interactions in multicomponent superconductors and superfluids

    Författare :Karl Sellin; Egor Babaev; Anatoly Kuklov; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fysik; Physics;

    Sammanfattning : Superconductivity and superfluidity are some of the most funda-mental and important phenomena of modern physics. However, muchtheoretical work for such systems so far has been restricted to the one-component case. LÄS MER

  4. 23. Optimization of High-order Harmonic Generation for Attosecond Science

    Författare :Robin Weissenbilder; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; High-order Harmonic Generation; Attosecond Pulse Train; attosecond dynamics; photoelectron interferometry; Quantum state tomography; Phase matching; Fysicumarkivet A:2023:Weissenbilder;

    Sammanfattning : High-order harmonic generation is a highly nonlinear, though inherently inefficient, process which can lead to emission of coherent, broadband extreme ultraviolet radiation in the form of attosecond pulses. Attosecond pulses are crucial for experiments investigating photoionization dynamics on the femto- and attosecond timescales. LÄS MER

  5. 24. Quantum dynamics of spin active and d-wave Josephson junctions

    Författare :Jens Harro Michelsen; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Josephson effect; macroscopic quantum tunneling; high-temperature superconducvity; superconducting junctions; spin-active junctions; nonequilibrium superconductivity; Andreev bound states;

    Sammanfattning : Conventional tunnel Josephson junctions form the basic building blocks of superconducting electronics. Their operation is based on comparatively simple dynamics where the superconducting phases across the junctions is the only dynamical degree of freedom. LÄS MER

  7. 25. Quantum Hall Skyrmions and Edge Spin Textures

    Författare :Kennet Lejnell; Carlos Tejedor; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Theoretical Physics; teoretisk fysik;

    Sammanfattning : In the quantum Hall effect, new and surprising phenomena continue to be uncovered. For example, in quantum Hall ferromagnets Skyrmions have been observed---these quasiparticles carry electric charge and a large spin. The spin is ordered in a beautiful wavelike pattern, as shown on the front of this thesis. LÄS MER