줌 정보: 별도 공지

 

Unique topological structure near an exceptional point has attracted much attention recently. Phase changes of the eigenmodes while encircling an exceptional point is one of its intriguing results. However, topological structure of nearly degenerated exceptional point, on the other hand, is an area where study is lacking. We present eigenenergy surface profile when there exist two exceptional point in the two dimensional parameter space.