Winding around non-Hermitian singularities View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2018-12

AUTHORS

Qi Zhong, Mercedeh Khajavikhan, Demetrios N. Christodoulides, Ramy El-Ganainy

ABSTRACT

Non-Hermitian singularities are ubiquitous in non-conservative open systems. Owing to their peculiar topology, they can remotely induce observable effects when encircled by closed trajectories in the parameter space. To date, a general formalism for describing this process beyond simple cases is still lacking. Here we develop a general approach for treating this problem by utilizing the power of permutation operators and representation theory. This in turn allows us to reveal a surprising result that has so far escaped attention: loops that enclose the same singularities in the parameter space starting from the same point and traveling in the same direction, do not necessarily share the same end outcome. Interestingly, we find that this equivalence can be formally established only by invoking the topological notion of homotopy. Our findings are general with far reaching implications in various fields ranging from photonics and atomic physics to microwaves and acoustics. More... »

PAGES

4808

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41467-018-07105-0

DOI

http://dx.doi.org/10.1038/s41467-018-07105-0

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1109841458

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30442951


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