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DTSTAMP:20260814T115941Z
LAST-MODIFIED:20140117T171937Z
DTSTART:20140131T170000Z
DTEND:20140131T180000Z
UID:event1126@bu.edu
URL:http://physics.bu.edu/internal/events/show/1126
SUMMARY:The Higgs (Amplitude) Mode in Ferromagnetic Metals
DESCRIPTION:Featuring Kevin Bedell\, Boston College\nHosted by: David Campb
	ell\n\nPart of the Biophysics/Condensed Matter Seminar Series.\n\nAbstract:
	\n\nUsing ferromagnetic Fermi liquid theory (FFLT)\, Bedell and Blagoev\,* 
	derived the collective low-energy excitations of a weak ferromagnet. They o
	btained the well-known magnon (Nambu-Goldstone) mode and found a new gapped
	 mode that was never studied in weak ferromagnetic metals. We recently iden
	tified this mode as the Higgs (amplitude) mode of a ferromagnetic metal sin
	ce it corresponds to a fluctuation of the amplitude of the order parameter 
	and it propagates. We use the FFLT to describe the itinerant-electron ferro
	magnetic material MnSi. By fitting the model with the existing experimental
	 results\, we calculate the dynamical structure function and see well-defin
	ed peaks coming from the magnon and the Higgs. Our estimates of the relativ
	e intensity of the Higgs amplitude mode suggest that it can be seen in neut
	ron scattering experiments on MnSi.\n\n*Bedell and Blagoev\, Phil. Mag. Let
	t. (2001)
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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