The 'Higgs' amplitude mode in weak ferromagnetic metals

Abstract

Using Ferromagnetic Fermi liquid theory, Bedell and Blagoev derived the collective low-energy excitations of a weak ferromagnet. They obtained the well-known magnon (Nambu-Goldstone) mode and found a new gapped mode that was never studied in weak ferromagnetic metals. In this article we have identified this mode as the Higgs boson (amplitude mode) of a ferromagnetic metal. This is identified as the Higgs since it can be show that it corresponds to a fluctuation of the amplitude of the order parameter. We use this model to describe the itinerant-electron ferromagnetic material MnSi. By fitting the model with the existing experimental results, we calculate the dynamical structure function and see well-defined peaks contributed from the magnon and the Higgs. Our estimates of the relative intensity of the Higgs amplitude mode suggest that it can be seen in neutron scattering experiments on MnSi.

4 pages, 3 figures to be submitted to PM'14 conference journal, i.e. Acta Physica Polonica A

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• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• The `Higgs' Amplitude Mode at the Two-Dimensional Superfluid-Mott Insulator Transition
• Visibility of the Amplitude (Higgs) Mode in Condensed Matter
• Dynamical properties of ultracold bosons in an optical lattice
• The Higgs mode in a two-dimensional superfluid
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Cited by in corpus (4)

• Unconventional Hund Metal in a Weak Itinerant Ferromagnet
• Universal Signatures of Majorana-like Quasiparticles in Strongly Correlated Landau-Fermi Liquids
• Quantum spin transport and dynamics through a novel F/N junction
• Gauging away the Stoner model: Engineering unconventional metallic ferromagnetism with artificial gauge fields