Stable dark solitons in PT-symmetric dual-core waveguides

被引：98
作者：
Bludov, Yu V. [1 ]
Konotop, V. V. [2 ,3 ]
Malomed, B. A. [4 ]
机构：
[1] Univ Minho, Ctr Fis, P-4710057 Braga, Portugal
[2] Univ Lisbon, Fac Ciencias, Ctr Fis Teor & Computac, P-1649003 Lisbon, Portugal
[3] Univ Lisbon, Fac Ciencias, Dept Fis, P-1649003 Lisbon, Portugal
[4] Tel Aviv Univ, Fac Engn, Sch Elect Engn, Dept Phys Elect, IL-69978 Tel Aviv, Israel
来源：
PHYSICAL REVIEW A | 2013年 / 87卷 / 01期
关键词：
STABILITY;
D O I：
10.1103/PhysRevA.87.013816
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We construct dark solitons in the recently introduced model of the nonlinear dual-core coupler with the mutually balanced gain and loss applied to the two cores, which is a realization of parity-time symmetry in nonlinear optics. The main issue is stability of the dark solitons. The modulational stability of the continuous-wave background, which supports the dark solitons, is studied analytically, and the full stability is investigated in a numerical form via computation of eigenvalues for modes of small perturbations. Stability regions are thus identified in the parameter space of the system and verified in direct simulations. Collisions between stable dark solitons are briefly considered too. DOI: 10.1103/PhysRevA.87.013816
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页数：7
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