Wavepacket Self-Rotation and Helical Zitterbewegung in Symmetry-Broken Honeycomb Lattices,Laser & Photonics Reviews

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Wavepacket Self-Rotation and Helical Zitterbewegung in Symmetry-Broken Honeycomb Lattices
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2021-05-26 , DOI: 10.1002/lpor.202000563
Xiuying Liu ₁ , Frane Lunić ₂ , Daohong Song _{1,

3} , Zhixuan Dai ₁ , Shiqi Xia ₁ , Liqin Tang ₁ , Jingjun Xu _{1,

3} , Zhigang Chen _{1,

3,

4} , Hrvoje Buljan _{1,

2}

Affiliation

The toolbox quantities used for manipulating the flow of light include typically amplitude, phase, and polarization. Pseudospins, such as those arising from valley degrees of freedom in photonic structures, have recently emerged as an excellent candidate for this toolbox, in parallel with rapid development of spintronics and valleytronics in condensed-matter physics. Here, by employing symmetry-broken honeycomb photonic lattices, valley-dependent wavepacket self-rotation manifested in spiraling intensity patterns is demonstrated, which occurs without any initial orbital angular momentum. Theoretically, it is shown that such wavepacket self-rotation is induced by the Berry phase and results in Zitterbewegung oscillations. The frequency of Zitterbewegung is proportional to the gap size, while the helicity of self-rotation is valley-dependent, i.e., correlated with the Berry curvature. These results lead to new understanding of the venerable Zitterbewegung phenomenon from the perspective of topology and are readily applicable on other platforms such as 2D Dirac materials and ultracold atoms.

中文翻译：

对称破缺蜂窝晶格中的波包自旋转和螺旋 Zitterbewegung

用于操纵光流的工具箱量通常包括振幅、相位和偏振。随着自旋电子学和谷电子学在凝聚态物理学中的快速发展，伪自旋，例如由光子结构中的谷自由度产生的伪自旋，最近已成为该工具箱的绝佳候选者。在这里，通过采用对称性破缺的蜂窝光子晶格，证明了以螺旋强度模式显示的谷相关波包自旋转，这种旋转没有任何初始轨道角动量发生。从理论上讲，这种波包自旋是由 Berry 相位引起的，并导致 Zitterbewegung 振荡。Zitterbewegung 的频率与间隙大小成正比，而自旋的螺旋度与谷值相关，即，与 Berry 曲率相关。这些结果导致从拓扑的角度对古老的 Zitterbewegung 现象有了新的理解，并且很容易应用于其他平台，例如 2D Dirac 材料和超冷原子。

更新日期：2021-07-08

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