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Observation of a topological transition in the bulk of a non-hermitian system

: Zeuner, Julia M.; Rechtsman, Mikael C.; Plotnik, Yonatan; Lumer, Yaakov; Nolte, Stefan; Rudner, Mark S.; Segev, Mordechai; Szameit, Alexander


Physical review letters 115 (2015), Nr.4, Art. 040402
ISSN: 0031-9007
ISSN: 1079-7114
Fraunhofer IOF ()

We present the first experimental observation of a topological transition in a non-Hermitian system. In contrast to standard methods for examining topological properties, which involve probing edge (or surface) states, we monitor the topological transition by employing bulk dynamics only. The system is composed of a lattice of evanescently coupled optical waveguides, and non-Hermitian behavior is engineered by inducing bending loss by spatially "wiggling" every second waveguide.