论文标题
Haldane Nanoribbons中的高谐波光子的螺旋性翻转
Helicity flip of high-harmonic photons in Haldane nanoribbons
论文作者
论文摘要
对凝结物质的高谐波光谱法的最新研究主要集中在所考虑的大部分系统上。在这项工作中，我们研究了薄的六边形纳米管对沿色带线性极化的强激光脉冲的响应。这样的纳米容器是二维系统的主要实例，它们在一个方向上像散装一样，在另一个方向上有限。尽管垂直于线性极化驱动激光场的方向的原子尺度在原子上较薄，但如果考虑到交替的现场电势和Haldane跳跃，发出的谐波仍在椭圆极化。对于给定的跳，我们发现某个谐波顺序的螺旋性突然改变。该翻转的起源可追溯到Bloch状态组件之间的相位差异。
Recent studies in high-harmonic spectroscopy of condensed matter mainly focused on the bulk of the system under consideration. In this work, we investigate the response of thin, hexagonal nanoribbons to an intense laser pulse that is linearly polarized along the ribbon. Such nanoribbons are prime examples of two-dimensional systems that are bulk-like in one direction and finite in the other direction. Despite the atomically thin scale in the direction perpendicular to the linearly polarized driving laser field, the emitted harmonics are elliptically polarized if an alternating onsite potential and Haldane hopping is taken into account. For given hoppings, we find a sudden change of the helicity for a certain harmonic order. The origin of this flip is traced back to phase differences between the components of Bloch states.
