标题： 时间布雷斯特异常和狄拉克材料中的准直波束操控 显示英文标题

标题： Temporal Brewster anomaly and collimated wave steering in Dirac materials

摘要： 时间无序-材料参数的时间随机波动-最近已成为控制波传播的有效工具，类似于空间无序系统中的安德森局域化。 在这里，我们从理论上引入并分析伪自旋-1/2狄拉克系统中的时间布儒斯特异常，证明即使矢量势的大小存在随机时间变化，狄拉克波沿固定方向的矢量势仍保持非局域化。 相反，以任何非轴向角度传播的波表现出明显的空间局域化和扩散行为。 这种方向选择性来源于时间阻抗匹配，之前已被确认为抑制沿矢量势轴的时间反射的机制。 通过分析时间反射率、波群速度和脉冲传播，我们确定这些系统作为动态方向滤波器运行，仅通过时间调制实现准直波的操控。 在狄拉克材料中，外部电场或机械应变可以动态控制矢量势调制的方向和强度，从而实现对方向波传输的精确实时调节。 因此，时间布儒斯特异常提供了一种强大且灵活的方法用于自适应波操控，在电子和光子器件中具有显著的技术应用前景。 显示英文摘要

摘要： Temporal disorder-random temporal fluctuations of material parameters-has recently emerged as an effective tool for controlling wave propagation, analogous to Anderson localization in spatially disordered systems. Here, we theoretically introduce and analyze the temporal Brewster anomaly in pseudospin-1/2 Dirac systems, demonstrating that Dirac waves remain delocalized along a vector potential with fixed direction despite random temporal variations in its magnitude. In contrast, waves propagating at any off-axis angle exhibit pronounced spatial localization and diffusive behavior. This directional selectivity arises from temporal impedance matching, previously identified as the mechanism suppressing temporal reflection along the vector potential axis. By analyzing temporal reflectance, wave group velocity, and pulse propagation, we establish that these systems function as dynamic directional filters, achieving collimated wave steering purely through temporal modulation. In Dirac materials, external electric fields or mechanical strain can dynamically control the orientation and strength of the vector potential modulation, enabling precise, real-time tuning of directional wave transmission. The temporal Brewster anomaly thus offers a robust and versatile approach for adaptive wave steering, promising significant technological applications in electronic and photonic devices.