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X-WR-CALNAME:Physics Colloquium: Edwin Fohtung\, Rensselaer Polytechnic Ins
 titute
X-WR-TIMEZONE:Eastern Time (US & Canada)
BEGIN:VEVENT
DTSTAMP:20260910T162105Z
UID:tag:localist.com\,2008:EventInstance_47233816343428
DTSTART:20241023T200000Z
DTEND:20241023T210000Z
DESCRIPTION:Twisted light-matter interaction and coherent scattering with X
 -rays\n\nRecent technological breakthroughs in synchrotron radiation and X
 FEL facilities have revolutionized our understanding of dynamical and emer
 gent behavior at the nanoscale by harnessing charge\, lattice\, spin\, and
  orbital degrees of freedom in condensed matter systems. In this presentat
 ion\, I will discuss our group's advancements in developing coherent scatt
 ering and diffractive imaging techniques [1]\, which are now at the forefr
 ont of exploring hard and soft condensed matter systems [2-4]. These techn
 iques\, notably Bragg coherent diffractive imaging\, x-ray photon correlat
 ion spectroscopy\, and  x-ray magnetic dichroism leverage beam coherence t
 o achieve volumetric three-dimensional imaging at unprecedented sub-nanome
 ter resolutions and explore dynamic phenomena within sub-millisecond timef
 rames. Such capabilities are critical in understanding and developing adva
 nced materials and technologies.\n\nSimultaneously\, the emergence of chir
 al phenomena in the lattice\, charge\, spin\, and orbital degrees of freed
 om-characterized by their unique absence of standard inversion\, mirror\, 
 or other roto-inversion symmetries-presents both challenges and opportunit
 ies. These materials exhibit distinctive interactions with light\, leading
  to phenomena such as molecular optical activity\, chiral photonic wavegui
 des\, and valley-specific light emissions\, which are pivotal in the burge
 oning fields of photonic and spintronic devices. I will address how novel 
 x-ray probes can be leveraged to unravel these properties and their implic
 ations for future technological applications. A significant focus of this 
 talk is the exploration of new avenues in research\, particularly the shif
 t from conventional methods to more innovative approaches in studying thes
 e chiral materials. Inspired by structured optical beams\, the potential o
 f coherent scattering techniques utilizing twisted x-ray beams will be exa
 mined. This promising direction not only offers higher spatio-temporal res
 olution but also opens the door to previously unattainable insights into c
 ondensed matter systems.\n\nReferences\n\n \n\nCoherent diffractive imagin
 g with twisted X-rays: Principles\, applications\, and outlook\, N. Nazirk
 ar\, et al.    Appl. Phys. Rev. 11\, 021302 (2024) Enhanced Piezoelectric 
 Response at Nanoscale Vortex Structures in Ferroelectrics. X. Shi et al. A
 CS Appl. Mater. Interfaces 2024\, 16\, 6\, 7522–7530 (2024) Three-dimens
 ional imaging of vortex structure in a ferroelectric nanoparticle driven b
 y an electric field. Karpov et al\, Nature Communications volume 8\, Artic
 le number: 280 (2017) Giant pyroelectricity in nanomembranes. Jian et al\,
  Nature volume 607\, pages 480–485 (2022)
LOCATION:Higgins Hall\, 310
SUMMARY:Physics Colloquium: Edwin Fohtung\, Rensselaer Polytechnic Institut
 e
URL;VALUE=URI:https://events.bc.edu/event/physics-colloquium-edwin-fohtung-
 rensselaer-polytechnic-institute
CATEGORIES:Lecture
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