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VERSION:2.0
PRODID:icalendar-ruby
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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260307T033956Z
UID:https://www.mpsd.mpg.de/events/15168/42308
DTSTART:20180917T083000Z
DTEND:20180917T093000Z
CLASS:PUBLIC
CREATED:20180904T142918Z
DESCRIPTION:Nonlinear optical properties of materials are important as tool
 s in basicresearch and optical technology. Recently there has been a treme
 ndousupsurge of interest in optical nonlinear effects\, especially in crys
 tals with curvedbandstructure geometry. Such materials are candidates for 
 applications basedon the conversion of light to dc current. In this talk I
  describe our discovery thata family of Weyl semimetals has by far the lar
 gest second-order susceptibility ofany previously known crystal. In puzzli
 ng over this result\, we uncovered asurprising theorem relating the streng
 th of optical nonlinearity to a quantuminvariant property of the bandstruc
 ture that unites nonlinear optics with thecelebrated “modern theory of p
 olarization.” This quantum invariant provides anew strategy for algorith
 mic computational searches for nonlinear materialswith optimal response fu
 nctions.\nVortragende(r): Joseph Orenstein
LAST-MODIFIED:20180904T142918Z
LOCATION:CFEL (Bldg. 99)\, Raum: Seminar Room IV\, O1.111
ORGANIZER;CN=Andrea Cavalleri:mailto:
SUMMARY:MPSD Seminar: California New Age Physics: Sunshine\, Crystals\, and
  Quantum Geometry of Bands
URL;VALUE=URI:https://www.mpsd.mpg.de/events/15168/42308
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