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UID:DSC-16281
DTSTART;TZID=Europe/Berlin:20190812T100000
SEQUENCE:1565561302
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20190812T110000
URL:https://dresden-science-calendar.de/calendar/en/detail/16281
LOCATION:IFW\, Helmholtzstraße 2001069 Dresden
SUMMARY:Liu: Topological  Points and Lines in Photonic Momentum Space
CLASS:PUBLIC
DESCRIPTION:Speaker: Prof. Rongjuan Liu\nInstitute of Speaker: Institute of
  Physics\, Chinese Academy of Sciences \nTopics:\n\n Location:\n  Name: IF
 W (D2E.31\, IFW Dresden)\n  Street: Helmholtzstraße 20\n  City: 01069 Dre
 sden\n  Phone: \n  Fax: \nDescription: The well-known degenerate points an
 d lines in momentum space are Dirac points\, Weyl points and nodal lines\,
  etc. for their topological properties. In this talk\, I will present some
  of our works on these topological states in photonic regime. Weyl points 
 are three-dimensional degenerate points.  Although many materials and stru
 ctures with Weyl points are reported since Weyl points were first discover
 ed in 2015\, all these Weyl points are not ideal for their energy are not 
 at the same energy and they are always accompanied  with some other trivia
 l bands. We designed and realized the ideal Weyl points in a three-dimensi
 onal photonic crystal composed of saddle-shaped metallic coils and observe
 d their surface states shown as helicoidal shape. In contrast to degenerat
 e points allowing for few structure variations\,  degenerate lines\, usual
 ly called as nodal lines\, have various configurations\, such as nodal rin
 gs\, nodal chains\, nodal links and nodal knots. However\, nodal lines are
  much less explored because of the lack of an ideal experimental realizati
 on. We theoretically predicted and experimentally observed nodal chains in
  a three-dimensional metallic-mesh photonic crystal. These topological sys
 tems provide photonic platform for exploring new topological properties an
 d developing possible topological devices.
DTSTAMP:20260521T030047Z
CREATED:20190718T220851Z
LAST-MODIFIED:20190811T220822Z
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