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arXiv 1907.06231nlin.SImath-phmath.MPnlin.PS
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非零背景下二能级系统的逆散射变换

Inverse scattering transform for two-level systems with nonzero background

Gino Biondini, Ildar Gabitov, Gregor Kovacic, Sitai Li

摘要:

在光强在无穷远处不为零的情况下,我们将标量Maxwell-Bloch方程组的逆散射变换公式化,该方程组描述了光与有源光学介质的共振相互作用。我们证明了纯背景态一般不存在非零背景场。然后,我们使用的形式明确计算该系统的孤子解。我们讨论了原子的初始布居,并证明了纯孤子解最初并不对应于纯态。我们得到了孤子解的行列式形式的表示,并明确写出了单孤子解。接下来,我们从单孤子解导出周期解和有理解。然后,我们分析这些解决方案的属性,包括讨论的尖锐线和小振幅的限制,此后表明,这两个限制不交换。最后,我们研究了一般解的行为,表明解是稳定的(即,溶液的辐射部分衰减)仅当最初处于基态的原子占优势时,即,初始粒子数反转是负的。

英文摘要:

We formulate the inverse scattering transform for the scalar Maxwell-Bloch system of equations describing the resonant interaction of light and active optical media in the case when the light intensity does not vanish at infinity. We show that pure background states in general do not exist with a nonzero background field. We then use the formalism to compute explicitly the soliton solutions of this system. We discuss the initial population of atoms and show that the pure soliton solutions do not correspond to a pure state initially. We obtain a representation for the soliton solutions in determinant form, and explicitly write down the one-soliton solutions. We next derive periodic solutions and rational solutions from the one-soliton solutions. We then analyze the properties of these solutions, including discussion of the sharp-line and small-amplitude limits, and thereafter show that the two limits do not commute. Finally, we investigate the behavior of general solutions, showing that solutions are stable (i.e., the radiative parts of solutions decay) only when initially atoms in the ground state dominant, i.e., initial population inversion is negative.

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