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UID:DSC-23099
DTSTART;TZID=Europe/Berlin:20260922T090000
SEQUENCE:1789537089
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20260922T100000
URL:https://dresden-science-calendar.org/calendar/en/detail/23099
LOCATION:IFW\, Helmholtzstraße 2001069 Dresden
SUMMARY:Wulfhekel: Excitations in two-dimensional\, non-collinear magnets
CLASS:PUBLIC
DESCRIPTION:Speaker: Prof. Dr. Wulf Wulfhekel\nInstitute of Speaker: Karlsr
 uhe Institute of Technology\nTopics:\n\n Location:\n  Name: IFW (D2E.27\, 
 IFW Dresden)\n  Street: Helmholtzstraße 20\n  City: 01069 Dresden\n  Phon
 e: \n  Fax: \nDescription: Magnetic excitations are at the heart of the dy
 namics of spin systems. Here\, we report on the first observation of two m
 agnetic excitations\, i.e.\, magnetic phasons in non-collinear spin textur
 es and magnon-polarons resulting from coupling of acoustic phonons and mag
 nons.  The nanoscopic magnetic texture forming in a monolayer of Fe/Ir(111
 ) is spatially modulated and uniaxially incommensurate with respect to the
  atomic lattice. As a consequence\, a low-energy magnetic excitation is ex
 pected that corresponds to the sliding of the texture along the incommensu
 rate direction\, i.e.\, a phason mode. Using spin-polarized STM\, the phas
 on has been experimentally observed and can be excited by the tunneling cu
 rrent. Fe3GeTe2 (FGT) is a ferromagnetic van der Waals material that hosts
  besides Skyrmions also collective excitations in form of magnons hybridiz
 ed with acoustic phonons. We study the dynamic coupling of these two excit
 ations in FGT using STM at ultra-low temperatures. A strong interaction be
 tween magnons and acoustic phonons leads to avoided band crossings and hyb
 ridization between the magnonic and phononic bands\, which lifts the const
 rains set by the selection rules for their individual excitation by electr
 ons and boosts the excitation cross sections. Our findings provide a platf
 orm for designing the properties of dynamic magnon-phonon coupling in two-
 dimensional materials in form of phonon-localization in magnetic domain wa
 lls or magnon localization by strain fields.
DTSTAMP:20260916T120927Z
CREATED:20260826T053552Z
LAST-MODIFIED:20260916T053809Z
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