论文标题
具有辅助轨道自由度的纳米力学拓扑绝缘子
Nanomechanical topological insulators with an auxiliary orbital degree of freedom
论文作者
论文摘要
离散的自由度，例如自旋和轨道，可以提供操纵电子，光子和声子的有趣策略。拓扑绝缘因素具有自旋程度，刺激了对凝结物理，光学，声学和力学的强烈兴趣。但是，轨道作为晶体中的另一个基本属性很少在拓扑绝缘子中研究。在这里，我们在纳米力学平台上发明了具有辅助轨道自由度的新型拓扑绝缘子。我们在实验中实现了轨道可以被晶体任意操纵的纳米力学拓扑绝缘子。利用这一独特的功能，我们展示了不同拓扑边缘状态之间的绝热过渡，这对于涉及不同拓扑边缘通道的复杂系统的关键功能。除了一维边缘状态之外，我们还进一步构建了零维的dirac涡流状态。我们的结果已经揭示了空前的策略来操纵拓扑相变并研究集成平台上物质的拓扑阶段。
Discrete degrees of freedom, such as spin and orbital, can provide intriguing strategies to manipulate electrons, photons, and phonons. With a spin degree of freedom, topological insulators have stimulated intense interests in condensed-matter physics, optics, acoustics, and mechanics. However, orbital as another fundamental attribute in crystals has seldom been investigated in topological insulators. Here, we invent a new type of topological insulators with an auxiliary orbital degree of freedom on a nanomechanical platform. We experimentally realized nanomechanical topological insulators where the orbital can arbitrarily be manipulated by the crystal. Harnessing this unique feature, we demonstrated adiabatic transition between distinct topological edge states, which is a crucial functionality for complicated systems that involve distinct topological edge channels. Beyond the one-dimensional edge states, we further constructed zero-dimensional Dirac-vortex states. Our results have unveiled unprecedented strategies to manipulate topological phase transitions and to study topological phases of matter on an integrated platform.
