Asymmetric soliton mobility in competing linear-nonlinear parity-time-symmetric lattices

We address the transverse mobility of spatial solitons in competing parity-time-symmetric linear and nonlinear lattices. The competition between out-of-phase linear and nonlinear lattices results in a drastic mobility enhancement within a range of soliton energies. We show that within such a range,...

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Bibliographic Details
Published in:Optics letters 2016-09, Vol.41 (18), p.4348-4351
Main Authors: Kartashov, Yaroslav V, Vysloukh, Victor A, Torner, Lluis
Format: Article
Language:English
Subjects:
Asymmetry
Ciències de la visió
Competition
Gain
Lattices
Nonlinear theories
Nonlinearity
Optics
Pattern formation and solitons
Quantum gases
Rest
Solitons
Teories no lineals
Tilt
Àrees temàtiques de la UPC
Òptica física
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Summary:We address the transverse mobility of spatial solitons in competing parity-time-symmetric linear and nonlinear lattices. The competition between out-of-phase linear and nonlinear lattices results in a drastic mobility enhancement within a range of soliton energies. We show that within such a range, the addition of even a small imaginary part in the linear potential makes soliton mobility strongly asymmetric. For a given initial phase tilt, the velocity of soliton motion grows with an increase of the balanced gain/losses. In this regime of enhanced mobility, tilted solitons can efficiently drag other solitons that were initially at rest to form moving soliton pairs.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.41.004348