标题： 动态调制零能隙周期系统的时间反演 显示英文标题

标题： Time-reversal in dynamically-tuned zero-gap periodic systems

摘要： 我们证明，通过在远慢于周期的时间尺度上使用弱非绝热波速调制，零带隙周期系统中的短脉冲可以以100%的效率被反转。 与之前的方法不同，我们展示了使用简单结构对{\em 宽带} (几周期) 脉冲进行反转。 因此，我们的方案可能为各种以前无法实现时间反转的系统打开新的途径。 显示英文摘要

摘要： We show that short pulses propagating in zero-gap periodic systems can be reversed with 100% efficiency by using weak non-adiabatic tuning of the wave velocity at time-scales that can be much slower than the period. Unlike previous schemes, we demonstrate reversal of {\em broadband} (few cycle) pulses with simple structures. Our scheme may thus open the way to time-reversal in a variety of systems for which it was not accessible before.