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arXiv 1608.08264physics.opticscond-mat.quant-gasnlin.PS
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竞争线性-非线性PT对称晶格中的非对称孤子迁移率

Asymmetric soliton mobility in competing linear-nonlinear PT-symmetric lattices

Yaroslav V. Kartashov, Victor A. Vysloukh, Lluis Torner

摘要:

研究了竞争宇称时间对称线性和非线性晶格中空间孤子的横向迁移率。异相线性和非线性晶格之间的竞争导致在孤子能量范围内迁移率的急剧增强。我们表明,在这样的范围内,即使是一个小的虚部的线性势的增加,使孤子迁移率强烈不对称。在与内部电流方向相反的方向上,将孤子设置为穿过晶格的无辐射运动所需的最小相位倾斜下降到几乎为零,而在相反方向上的运动所需的最小相位倾斜显著增加。对于一个给定的初始相位倾斜,孤子的运动速度随着平衡增益/损耗的增加而增加。在这种增强的迁移率的制度,倾斜孤子可以有效地拖动其他孤子,最初是在休息,形成移动孤子对。

英文摘要:

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 range, the addition of even a small imaginary part in the linear potential makes soliton mobility strongly asymmetric. The minimal phase tilt required for setting solitons into radiationless motion across the lattice in the direction opposite to that of the internal current drops to nearly zero, while the minimal phase tilt required for motion in the opposite direction notably increases. 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.

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