• Photonics Research
  • Vol. 6, Issue 9, 875 (2018)
Xiankun Yao and Xueming Liu*
Author Affiliations
  • State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, Hangzhou 310027, China
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    DOI: 10.1364/PRJ.6.000875 Cite this Article Set citation alerts
    Xiankun Yao, Xueming Liu. Solitons in the fractional Schrödinger equation with parity-time-symmetric lattice potential[J]. Photonics Research, 2018, 6(9): 875 Copy Citation Text show less

    Abstract

    We investigate the properties of spatial solitons in the fractional Schr dinger equation (FSE) with parity-time (PT)-symmetric lattice potential supported by the focusing of Kerr nonlinearity. Both one- and two-dimensional solitons can stably propagate in PT-symmetric lattices under noise perturbations. The domains of stability for both one- and two-dimensional solitons strongly depend on the gain/loss strength of the lattice. In the spatial domain, the solitons are rigidly modulated by the lattice potential for the weak diffraction in FSE systems. In the inverse space, due to the periodicity of lattices, the spectra of solitons experience sharp peaks when the values of wavenumbers are even. The transverse power flows induced by the imaginary part of the lattice are also investigated, which can preserve the internal energy balances within the solitons.
    iψz(2x2)α/2ψ+V(x)ψ+|ψ|2ψ=0,(1)

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    nAmnBn|k+Km|αAm=βAm,(2)

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    i(Lϕ2ϕ*2L*)(vw)=λ(vw),(3)

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    iψz(2x22y2)α/2ψ+V(x,y)ψ+|ψ|2ψ=0.(4)

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    Xiankun Yao, Xueming Liu. Solitons in the fractional Schrödinger equation with parity-time-symmetric lattice potential[J]. Photonics Research, 2018, 6(9): 875
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