“Emergent localized states at the interface of a twofold PT-symmetric lattice”

Dr. Sang-Jun Choi
Center of Theoretical PCS of the Institute for Basic Science

Jun. 14 (Fri.), 05:00 PM
E6-2. 2nd fl. #2501

Abstract:
The emergence of topologically robust states has been understood in terms of the bulk-edge correspondence; they appear at the boundary between two insulating systems whose topology cannot be continuously deformed into another. However, is its converse true? We find that at the boundary between topologically trivial non-Hermitian systems, a robust localized state can appear. We provide a new topological identification that two-fold PT-symmetry of the system protects the emergence of such a state against continuous deformations. Moreover, we show the localization length of the topological defect state is insensitive to a wide range of parameters.