发表机构
Korea Advanced Institute of Science and Technology (KAIST); Pukyong National University; Hanyang University(韩国科学技术院; 釜庆国立大学; 汉阳大学)
机构由 AI 辅助整理,请以论文原文为准。AI 中文总结
本文研究光子时间晶体中波作用的拓扑泵浦,通过连接带拓扑与波作用的时间位移,发现绝热周期内中心位移等于带陈数,揭示了拓扑输运的新机制。
AI 中文摘要
拓扑泵浦输运一个守恒量。然而,时间调制与场交换能量,因此输运量必须从麦克斯韦方程组中识别。在这里,我们将带拓扑与光子时间晶体中守恒的麦克斯韦波作用的时间位移联系起来。一个孤立正作用带的瞬态Wannier函数携带单位作用且净能量通量为零,其时间中心是Berry极化。在一个绝热周期内,该中心移动带陈数:对于刚性平移移动一个晶胞,对于单带内的双音周期移动两个晶胞。
英文摘要
A topological pump transports a conserved quantity. Yet temporal modulation exchanges energy with the field, so the transported quantity must be identified from Maxwell's equations. Here we connect band topology to the temporal displacement of conserved Maxwell wave action in a photonic time crystal. The temporal Wannier function of an isolated positive-action band carries unit action with zero net energy flux, and its temporal center is a Berry polarization. Over one adiabatic cycle, that center shifts by the band Chern number: one cell for a rigid translation and two for a two-tone cycle within a single band.