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Unbreakable PT symmetry of solitons supported by inhomogeneous defocusing nonlinearity

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Kartashov, Yaroslav
Malomed, Boris A.
Torner Sabata, LluísMés informacióMés informació
Document typeArticle
Defense date2014-09-24
PublisherOSA
Rights accessOpen Access
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
Description
We 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.
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. 
URIhttp://hdl.handle.net/2117/24354
ISSN0146-9592
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  • Nonlinear optical phenomena - Articles de revista [15]
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