Journal
PHYSICAL REVIEW LETTERS
Volume 120, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.113901
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Funding
- Office of Naval Research (ONR) [N00014-16-1-2640]
- National Science Foundation (NSF) [ECCS-1454531, DMR-1420620, ECCS-1757025]
- Air force Office of Scientific Research (AFOSR) [FA9550-14-1-0037]
- Binational Science Foundation (BSF) [2016381]
- Army Research Office (ARO) [W911NF-16-1-0013, W911NF-17-1-0481]
- Qatar National Research Fund [NPRP 9-020-1-006]
- European Commission Non-Hermitian Quantum Wave Engineering (NHQWAVE) project [MSCA-RISE 691209]
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We report the first observation of lasing topological edge states in a 1D Su-Schrieffer-Heeger active array of microring resonators. We show that the judicious use of non-Hermiticity can promote single edge-mode lasing in such arrays. Our experimental and theoretical results demonstrate that, in the presence of chiral-time symmetry, this non-Hermitian topological structure can experience phase transitions that are dictated by a complex geometric phase. Our work may pave the way towards understanding the fundamental aspects associated with the interplay among non-Hermiticity, nonlinearity, and topology in active systems.
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