螺旋性调控的光激发拓扑半金属中的非线性光学响应
Helicity-engineered nonlinear optical responses in photo-excited topological semimetals
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中文总结 AI 辅助
本文通过双圆偏振泵浦-探测驱动场调控Weyl半金属的高次谐波产生，发现边带强度对脉冲螺旋性和偏振平面取向敏感，可作为电子-空穴退相干时钟，为手性量子动力学探测和拓扑电流操控提供新框架。
中文摘要 AI 辅助
拓扑材料为光驱动电子运动控制提供了一个变革性的平台；然而，在亚周期时间尺度上直接操纵电子动力学仍然是一个重大挑战。我们证明，通过双圆偏振泵浦-探测驱动场，可以控制和操纵Weyl半金属的强场驱动高次谐波产生。虽然单独的探测脉冲仅产生奇次谐波，但添加泵浦脉冲会触发一系列由泵浦和探测光子非线性频率混合产生的边带。我们的结果表明，边带强度对脉冲的相对螺旋性和偏振平面的取向高度敏感。这种敏感性源于Weyl节点的手性性质，只有当节点分离轴垂直于偏振平面时，它才能有效地与光的螺旋性耦合。此外，随着泵浦-探测延迟的增加，边带强度显著抑制，将这些特征确定为电子-空穴退相干的潜在时钟。这些发现确立了频率混合高次谐波产生作为手性量子动力学的灵敏探针，并提出了通过结构化光操纵拓扑电流的稳健框架，对光波电子学和超快量子信息处理具有重要意义。
英文摘要
Topological materials provide a transformative arena for light-driven control of electronic motion; yet, direct manipulation of electron dynamics on sub-cycle timescale remains a significant challenge. We demonstrate that the strong-field-driven high-harmonic generation of a Weyl semimetal can be controlled and manipulated through bicircular pump-probe driving fields. While a lone probe pulse generates exclusively odd-order harmonics, the addition of a pump pulse triggers a series of sidebands arising from nonlinear frequency mixing of pump and probe photons. Our results reveal that the sideband intensities are highly sensitive to the relative helicity of the pulses and the orientation of the polarization plane. This sensitivity stems from the chiral nature of the Weyl nodes, which couples efficiently to the light's helicity only when the node-separation axis is perpendicular to the polarization plane. Furthermore, the significant suppression of sideband intensity with increasing pump-probe delay identifies these features as a potential clock for electron-hole decoherence. These findings establish frequency-mixed high-harmonic generation as a sensitive probe of chiral quantum dynamics and suggest a robust framework for manipulating topological currents via structured light, with implications for lightwave electronics and ultrafast quantum information processing.
发表机构
- Indian Institute of Technology Bombay（印度理工学院孟买分校）
- OIST Graduate University（冲绳科学技术大学院大学）
机构由 AI 辅助整理，请以论文原文为准。
