Observation of a Topological Transition in the Bulk of a Non-Hermitian System

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

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539 Scopus citations


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.

Original languageEnglish (US)
Article number040402
JournalPhysical review letters
Issue number4
StatePublished - Jul 23 2015

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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