BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//RLASKEY//CALENDEROUS//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260815T092849Z
LAST-MODIFIED:20170912T161810Z
DTSTART:20170915T160000Z
DTEND:20170915T173000Z
UID:event1833@bu.edu
URL:http://physics.bu.edu/internal/events/show/1833
SUMMARY:"Resonant x-ray spectroscopy of topological semimetals"
DESCRIPTION:Featuring Stefanos Kourtis\, Boston University\, Physics Depart
	ment\n\nPart of the Condensed Matter Theory Seminar Series.\n\nAngle-resolv
	ed photoemission spectroscopy (ARPES) has so far been the definitive method
	 for the characterization of materials as topological Weyl or Dirac semimet
	als\, via direct visualization of band touchings in the bulk and nontrivial
	 states at the boundary. However\, the unconventional and potentially usefu
	l properties of these materials are a consequence of a singular Berry curva
	ture distribution\, which cannot be resolved in ARPES. Furthermore\, contro
	l over the number and position of Weyl nodes -- the most important property
	 from an application standpoint -- can only be achieved with sizable electr
	omagnetic fields\, which curtail the resolving power of ARPES\, thereby ren
	dering the band structure inaccessible to this technique. We show how reson
	ant x-ray scattering (RXS) offers a viable path for (a) deducing the band s
	tructure of materials in arbitrarily large magnetic fields and (b) visualiz
	ing the Berry curvature distribution in momentum space via polarization con
	trol of incoming and outgoing x-ray beams. By low-energy modeling of specif
	ic material candidates based on ab initio band structure calculations\, we 
	derive the corresponding RXS spectra and highlight the salient features ste
	mming from topological nontriviality. The proposed measurements are within 
	the resolving capabilities of current instrumentation.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
END:VEVENT
END:VCALENDAR