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dc.contributor.authorKartashov, Yaroslav
dc.contributor.authorMalomed, Boris A.
dc.contributor.authorTorner Sabata, Lluís
dc.identifier.citationKartashov, Yaroslav; Malomed, Boris A.; Torner Sabata, Lluís. Unbreakable PT symmetry of solitons supported by inhomogeneous defocusing nonlinearity. "Optics Letters", 24 Setembre 2014, vol. 39, núm. 19, p. 5641-5644.
dc.descriptionWe consider bright solitons supported by a symmetric inhomogeneous defocusing nonlinearity growing rapidly enough toward the periphery of the medium, combined with an antisymmetric gain–loss profile. Despite the absence of any symmetric modulation of the linear refractive index, which is usually required to establish a parity-time (PT) symmetry in the form of a purely real spectrum of modes, we show that the PT symmetry is never broken in the present system, and that the system always supports stable bright solitons, i.e., fundamental and multi-pole ones. This fact is connected to the nonlinearizability of the underlying evolution equation. The increase of the gain–loss strength results, in lieu of the PT symmetry breaking, in merger of pairs of different soliton branches, such as fundamental and dipole, or tripole and quadrupole ones. The fundamental and dipole solitons remain stable at arbitrarily large values of the gain–loss coefficient.
dc.subject.lcshNonlinear optics
dc.subject.otherNonlinear optics
dc.titleUnbreakable PT symmetry of solitons supported by inhomogeneous defocusing nonlinearity
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (published version)
local.citation.authorKartashov, Yaroslav; Malomed, Boris A.; Torner Sabata, Lluís
local.citation.publicationNameOptics Letters

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