Stabilization of one-dimensional Townes solitons by spin-orbit coupling in a dual-core system

Elad Shamriz, Zhaopin Chen*, Boris A. Malomed

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


It was recently demonstrated that 2D Townes solitons (TSs) in two-component systems with cubic self-focusing, which are normally made unstable by the critical collapse, can be stabilized by linear spin-orbit coupling (SOC), in Bose-Einstein condensates and optics alike. We demonstrate that 1D TSs, realized as optical spatial solitons in a planar dual-core waveguide with dominant quintic self-focusing, may be stabilized by SOC-like terms emulated by obliquity of the coupling between cores of the waveguide. Thus, SOC offers a universal mechanism for the stabilization of (quasi-) TSs. A combination of systematic numerical considerations and analytical approximations identifies a vast stability area for skew-symmetric solitons in the system's main (semi-infinite) and annex (finite) bandgaps. Tilted (”moving”) solitons are unstable, spontaneously evolving into robust breathers. For broad solitons, diffraction, represented by second derivatives in the system, may be neglected, leading to a simplified model with a finite bandgap. It is populated by skew-antisymmetric gap solitons, which are nearly stable close to the gap's bottom.

Original languageEnglish
Article number105412
JournalCommunications in Nonlinear Science and Numerical Simulation
StatePublished - Dec 2020


  • Dual-core waveguides
  • Quintic nonlinearity
  • Spin-orbit coupling
  • Townes soliton


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