Browsing Institutt for fysikk by Author "Jakobsen, Martin Fonnum"

Now showing items 1-4 of 4

    • A Soft-Limit Theorem for the On-Shell Scattering Amplitudes Describing Processes Involving Massive Nambu-Goldstone Bosons 

      Jakobsen, Martin Fonnum (Master thesis, 2017)
      In this thesis we consider systems where both Lorentz invariance and a continuous symmetry group G is explicitly broken by coupling a chemical potential µ to one of the generators Q of G. In such systems it is well known ...

    • Scattering amplitudes of massive Nambu-Goldstone bosons 

      Brauner, Tomas; Jakobsen, Martin Fonnum (Journal article; Peer reviewed, 2018)
      Massive Nambu-Goldstone (mNG) bosons are quasiparticles the gap of which is determined exactly by symmetry. They appear whenever a symmetry is broken spontaneously in the ground state of a quantum many-body system and at ...

    • Scattering theory of transport through disordered magnets 

      Jakobsen, Martin Fonnum; Qaiumzadeh, Alireza; Brataas, Arne (Journal article; Peer reviewed, 2019)
      We present a scattering theory of transport through noncollinear disordered magnetic insulators. For concreteness, we study and compare the random field model (RFM) and the random anisotropy model (RAM). The RFM and RAM ...

    • Transport in Magnetic and Superconducting Heterostructures 

      Jakobsen, Martin Fonnum (Doctoral theses at NTNU;2021:374, Doctoral thesis, 2021)
      In essence, spintronics aims to utilize the spins of electrons to store and process information, either as a supplement to or as a replacement for electron charges. Electron spins are particularly suitable for use in ...