BEGIN:VCALENDAR
VERSION:2.0
PRODID:icalendar-ruby
CALSCALE:GREGORIAN
X-WR-CALNAME:Special Physics Colloquium\, "Chirality\, Spin\, and Broken Sy
 mmetry: New Insights into Chirality-Induced Spin Selectivity from Chiral H
 ybrid Semiconductors"
X-WR-TIMEZONE:Mountain Time (US & Canada)
BEGIN:VEVENT
DTSTAMP:20260609T180444Z
UID:tag:localist.com\,2008:EventInstance_52364964059650
DTSTART:20260323T210000Z
DTEND:20260323T220000Z
DESCRIPTION:Presented by: Matthew C. Beard\, National Laboratory of the Roc
 kies\n\nAbstract: The interplay between spin and charge in chiral material
 s — ranging from simple organic molecules to complex hybrid semiconducto
 rs — has emerged as one of the more intriguing open scientific problems.
  Chirality is fundamentally a symmetry question — an object is chiral if
  it cannot be superimposed on its mirror image — and chirality-induced s
 pin selectivity (CISS)\, whereby chiral materials preferentially transmit 
 electrons of a particular spin orientation\, is a striking consequence of 
 this broken symmetry. This observation has proven controversial\, as large
  spin polarization from organic molecules challenges conventional wisdom a
 bout the requirements for spin-selective transport. The underlying symmetr
 y constraint is elegant: reversing the structural handedness or the electr
 on spin independently produces measurably different outcomes\, while rever
 sing both simultaneously leaves observables unchanged. Yet translating the
 se symmetry constraints into a complete microscopic theory has remained ch
 allenging despite two decades of robust experimental evidence. We have dev
 eloped a new class of chiral organic-inorganic hybrid semiconductors in wh
 ich chiral molecules imbue chirality into an inorganic semiconductor frame
 work. Using this platform\, I will present experimental demonstrations of 
 both CISS and Inverse-CISS and show how the observed symmetry behavior pla
 ces meaningful constraints on theory. These constraints point toward a nat
 ural resolution in which spin and spatial degrees of freedom in chiral mat
 erials are fundamentally non-separable\, giving rise to spin-displacement 
 order with no analog in achiral systems.\n\nHost: Markus Raschke
GEO:40.007992;-105.267479
LOCATION:Duane Physics and Astrophysics\, G1B20
SUMMARY:Special Physics Colloquium\, "Chirality\, Spin\, and Broken Symmetr
 y: New Insights into Chirality-Induced Spin Selectivity from Chiral Hybrid
  Semiconductors"
URL;VALUE=URI:https://calendar.colorado.edu/event/physics-colloquium-chiral
 ity-semiconductors
CATEGORIES:Colloquium/Seminar
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