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SUMMARY: Non-Hermitian topological phenomena: Exceptional points\, symmetr
 y and breakdown of the bulk-boundary correspondence - Flore Kunst\, MPL Er
 langen
DTSTART:20220127T130000Z
DTEND:20220127T140000Z
UID:TALK166792@talks.cam.ac.uk
CONTACT:Jan Behrends
DESCRIPTION: While topological phases of matter have mostly been studied f
 or closed\,\nHermitian systems\, a recent shift has been made towards cons
 idering these phases in the context of non-Hermitian Hamiltonians\, which 
 form a useful approach to describe dissipation. Such Hamiltonians may feat
 ure many exotic properties\, which are radically different from their Herm
 itian counterparts\, such as the generic appearance of exceptional points\
 , a break down of the famed bulk-boundary correspondence\, and the piling 
 up of bulk states at the boundaries known as the non-Hermitian skin effect
 . In this talk\, I will make use of two-band models to study these feature
 s in more detail\, and study the appearance of exceptional points in the p
 resence of symmetries. Additionally\, I will show that even though the con
 ventional bulk-boundary correspondence breaks down\, it is possible to def
 ine a biorthogonal bulk-boundary correspondence by making use of biorthogo
 nal quantum mechanics.
LOCATION:Details of video conferencing will be distributed nearer the time
 .
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