Scars of Kramers–Henneberger atoms

IF 1.5 4区 物理与天体物理 Q3 OPTICS
E. Floriani, J. Dubois, C. Chandre
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Abstract

Electron motion in an atom driven by an intense linearly polarized laser field can exhibit a laser-dressed stable state, referred to as the Kramers–Henneberger (KH) state or KH atom. Up to now, the existence conditions of this state rely on the presence of a double well in the KH potential, obtained by averaging the motion over one period of the laser. However, the approximation involved in the averaging is largely invalid in the region of the double well structure; therefore, this raises the question of its relevance for identifying signatures of these exotic states. Here, we present a method to establish conditions for the existence of the KH atom based on a nonperturbative approach. We show that the KH atom is structured by an asymmetric periodic orbit with the same period as the laser field in a wide range of laser parameters. Its imprint is clearly visible on the wavefunction in quantum simulations. We identify the range of parameters for which this KH state is effective, corresponding to an elliptic periodic orbit.

Abstract Image

克拉默-亨内伯格原子的伤疤
在强线偏振激光场的驱动下,原子中的电子运动可以表现出激光修饰的稳定状态,称为克雷默斯-亨内伯格(KH)态或KH原子。到目前为止,这种状态的存在条件依赖于在KH势中存在双阱,这是通过平均激光在一个周期内的运动得到的。然而,在双井构造区域,平均所涉及的近似基本上是无效的;因此,这就提出了它与识别这些奇异状态的特征的相关性的问题。在这里,我们提出了一种基于非微扰方法来建立KH原子存在条件的方法。结果表明,在较宽的激光参数范围内,KH原子具有与激光场周期相同的非对称周期轨道结构。在量子模拟中,它的印记在波函数上清晰可见。我们确定了KH态有效的参数范围,对应于一个椭圆周期轨道。
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来源期刊
The European Physical Journal D
The European Physical Journal D 物理-物理:原子、分子和化学物理
CiteScore
3.10
自引率
11.10%
发文量
213
审稿时长
3 months
期刊介绍: The European Physical Journal D (EPJ D) presents new and original research results in: Atomic Physics; Molecular Physics and Chemical Physics; Atomic and Molecular Collisions; Clusters and Nanostructures; Plasma Physics; Laser Cooling and Quantum Gas; Nonlinear Dynamics; Optical Physics; Quantum Optics and Quantum Information; Ultraintense and Ultrashort Laser Fields. The range of topics covered in these areas is extensive, from Molecular Interaction and Reactivity to Spectroscopy and Thermodynamics of Clusters, from Atomic Optics to Bose-Einstein Condensation to Femtochemistry.
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