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SUMMARY:Topological phonons in ferroelectrics switched by light - Bo Peng
DTSTART:20200304T113000Z
DTEND:20200304T123000Z
UID:TALK140539@talks.cam.ac.uk
CONTACT:77905
DESCRIPTION:Topological states of electrons and photons have been well stu
 died. I will talk about topological phonons and where to find them. Even i
 n well-known materials\, such phonon topology can be found everywhere and 
 are protected by certain crystalline symmetry. In ferroelectrics\, structu
 ral phase transition breaks the inversion symmetry in one direction while 
 preserves mirror symmetry in another\, leading to the emergence of Weyl ph
 onons with coexisting nodal line phonons. Such topological phase can be sw
 itched on/off by light even without structural phase transition.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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