2021
DOI: 10.1126/science.abf6873
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Nonlinear tuning of PT symmetry and non-Hermitian topological states

Abstract: Topology, parity-time (PT) symmetry, and nonlinearity are at the origin of many fundamental phenomena in complex systems across the natural sciences, but their mutual interplay remains unexplored. We established a nonlinear non-Hermitian topological platform for active tuning of PT symmetry and topological states. We found that the loss in a topological defect potential in a non-Hermitian photonic lattice can be tuned solely by nonlinearity, enabling the transition between PT-symmetric and non–PT-symmetric reg… Show more

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Cited by 239 publications
(103 citation statements)
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References 54 publications
(105 reference statements)
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“…Introduction-Non-Hermitian topological phases constitute one of the most recent active research fields in condensed matter, cold atom, and photonic physics . They have been experimentally realized in different platforms of high controllability [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44]. So far, most previous efforts have been devoted to single-particle physics, with no or only perturbatively small many-body interactions.…”
mentioning
confidence: 99%
“…Introduction-Non-Hermitian topological phases constitute one of the most recent active research fields in condensed matter, cold atom, and photonic physics . They have been experimentally realized in different platforms of high controllability [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44]. So far, most previous efforts have been devoted to single-particle physics, with no or only perturbatively small many-body interactions.…”
mentioning
confidence: 99%
“…So far, there are still some challenges waiting to be solved, such as the realization of TES in the visible range, more compact devices with less loss. Furthermore, in recent years, topological photonics has extended to nonlinearity (Lan et al, 2020;Xia et al, 2020), non-Hermitian (Martinez Alvarez et al, 2018Pan et al, 2018;Höckendorf et al, 2019;Liu et al, 2020;Xia et al, 2021), and synthetic dimension scales (Lin et al, 2016;Lu et al, 2021;Ni and Alù, 2021); it is worth trying to implement them based on MO effects.…”
Section: Discussion and Perspectivementioning
confidence: 99%
“…22,32,75 We believe that our results may prove relevant to other type-II systems such as nonlinear effects and high-frequency rectification in type-II topological semimetals 76 and may also enlighten new ideas in nonlinear non-Hermitian topological systems. 77 Moreover, there is still a plethora of interesting topics yet to be explored in nonlinear systems that could involve type-II Dirac points, including higher-order topological phases, 73,75,78 new physics arising from engineered longitudinal modulation, 79,80 synthetic dimensions, 81 and even the innovation of topological semiconductor laser technologies. [17][18][19][20] Thus, our work on nonlinear VHE states in engineered type-II lattices will surely stimulate further interest in topological photonics-an area that will continue to grow in the next decade.…”
Section: Discussionmentioning
confidence: 99%