具有辅助轨道自由度的纳米机械拓扑绝缘体
Nanomechanical topological insulators with an auxiliary orbital degree of freedom
摘要：
离散的自由度，如自旋和轨道，可以提供有趣的策略来操纵电子，光子和声子。由于具有自旋自由度，拓扑绝缘体在凝聚态物理、光学、声学和力学等领域引起了人们极大的兴趣。然而，轨道作为晶体的另一个基本属性，在拓扑绝缘体中却很少被研究。在这里，我们发明了一种新型的拓扑绝缘体，在纳米机械平台上具有辅助轨道自由度。我们在实验上实现了纳米机械拓扑绝缘体，其中轨道可以任意操纵的晶体。利用这一独特的功能，我们证明了不同的拓扑边缘状态之间的绝热过渡，这是一个重要的功能，复杂的系统，涉及不同的拓扑边缘通道。在一维边缘态的基础上，我们进一步构造了零维Dirac涡旋态。我们的研究结果揭示了前所未有的策略，操纵拓扑相变和研究拓扑相的物质在一个集成的平台上。
英文摘要：
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.
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