Frustrated tunneling dynamics in ultrashort laser pulses

The role of tunneling in the ionization of atoms by ultrashort and intense laser pulses

Classically allowed transport is shown to compete with quantum tunneling during the ionization of atoms by ultrashort and intense laser pulses, despite Keldysh parameters smaller than unity. This is done by comparing exact probability densities with the ones obtained from purely classical propagation using the Truncated Wigner Approximation. Not only is classical transport capable of moving trajectories away from the core, but it can also furnish ionization probabilities of the same order as the quantum ones for intensities currently employed in experiments. Our results have implications rangi…

Tunneling ionization in ultrashort laser pulses: edge-effect and remedy

Tunneling ionization of an atom in ultrashort laser pulses is considered. When the driving laser pulse is switched-on and -off with a steep slope, the photoelectron momentum distribution (PMD) shows an edge-effect because of the photoelectron diffraction by the time-slit of the pulse. The trivial diffraction pattern of the edge effect consisting of fast oscillations in the PMD disguises in the deep nonadiabatic regime the physically more interesting features in the spectrum which originate from the photoelectron dynamics. We point out the precise conditions how to avoid this scenario experimen…

在扩展的Bose-哈伯德模型中超导挫挫导致的特殊超固相

Tunneling frustration induced peculiar supersolid phases in the extended Bose-Hubbard model

利用张量网络态方法研究了具有次近邻隧穿效应的正方晶格上的扩展Bose-哈伯德模型的基态相图.在硬核极限下，隧穿阻挫稳定了一个特殊的半超固体（HSS）相，其中一个亚晶格是超流体，另一个亚晶格是远离半填充的莫特绝缘体。在软核的情况下，该模型显示了非常丰富的相图以上半填充，包括三种不同类型的超固相取决于相互作用参数。所考虑的模型提供了一个有前途的路线，实验上寻找新的稳定的超固态的沮丧隧道在以下半填充区与偶极原子或分子。

阻挫的total internal reflection和超光速传播的错觉

Frustrated total internal reflection and the illusion of superluminal propagation

我们分析了一个脉冲的传播跨越真空间隙分离相对平坦的平行面的两个透明的双折射通过一个明确的因果关系和延迟传播直接从自由空间波方程构建。然而，我们的方法产生明显的超光速传播的情况下，受抑的全内反射（FTIR），即，一个透射波包出现在远侧的间隙在同一时间，相应的入射包穿过前面的。因此，在这个例子中，超光性只是一种幻觉，与物理性和经典电动力学都是一致的。我们研究了在这种情况下，这是固有的光脉冲在自由空间中的传播，并不依赖于光-物质相互作用的细节，并发现它是由于从入射脉冲的侧翼传播到传输脉冲的中心部分的表观超发光的起源。因此，尽管它们相似，FTIR并不等同于1D隧穿。我们提出了实验来测试我们的解释超光速使用不透明的屏幕，以阻止部分波前，虽然我们证明，传播的光滑有限脉冲限制完全由倏逝傅立叶分量是无法区分的真正超光速传播，即，它可以完全占使用一个explicitely超光速和因果传播以及因果subluminal一个。