利用非线性光学观测金刚石中的拓扑表面声子
Observation of topological surface phonons in diamond with nonlinear optics
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中文总结 AI 辅助
本研究利用和频光谱在金刚石中首次实验观测到拓扑表面声子，揭示其体相拓扑节线与三重点，并探究表面化学修饰的无序效应，连接了量子拓扑与晶格动力学。
中文摘要 AI 辅助
电子系统中的拓扑量子态深刻改变了人们对物质相的理解。近期理论预测了各种固体中存在新颖的振动拓扑量子态，即拓扑声子。然而，由于缺乏对拓扑表面声子（拓扑声子态的标志性特征）的令人信服的实验验证，这一范式尚未确立。在此，我们报道了利用和频光谱（一种能够高灵敏度探测表面声子的非线性光学光谱技术）在金刚石中发现拓扑表面声子。金刚石以卓越的硬度和热输运性能著称，现被揭示为一种声子拓扑半金属，其体相中承载着拓扑节线和连接三重点。通过理论与实验的一致结合，我们揭示了金刚石（111）和（100）表面上由此产生的拓扑表面声子。此外，通过化学修饰这些表面，我们揭示了无序效应对拓扑表面声子的影响。这些发现为连接量子拓扑与晶格动力学这两个基础领域铺平了道路，并对基于金刚石的器件和功能界面具有重要意义。
英文摘要
Topological quantum states in electronic systems have profoundly transformed the understanding of phases of matter. Recent theories predict novel vibrational topological quantum states, i.e., topological phonons in various solids. However, this paradigm is yet to be established due to the lack of convincing experimental verification of topological surface phonons---a hallmark signature of topological phonon states. Here, we report the discovery of topological surface phonons in diamond using sum-frequency spectroscopy---a nonlinear optical spectroscopy capable of probing surface phonons with high sensitivity. Diamond, known for exceptional hardness and thermal transport, is unveiled as a phonon topological semimetal hosting topological nodal-lines and nexus triple points in the bulk. With consistent theory and experiments, we uncover the resultant topological surface phonons on diamond (111) and (100) surfaces. Moreover, by chemically modifying these surfaces, we reveal the disorder effect on topological surface phonons. These findings pave the way for bridging two fundamental domains: quantum topology and lattice dynamics, besides having important implications on diamond-based devices and functional interfaces.
发表机构
- Suzhou Institute for Advanced Research, University of Science and Technology of China（中国科学技术大学苏州高等研究院）
- School of Biomedical Engineering, Suzhou Institute for Advanced Research, University of Science and Technology of China（中国科学技术大学苏州高等研究院生物医学工程学校）
- Fudan University（复旦大学）
- Soochow University（苏州大学）
- The University of Hong Kong（香港大学）
- Huazhong University of Science and Technology（华中科技大学）
- Tongji University（同济大学）
- Lishui Spring Technology Co., Ltd.（丽水春科技有限公司）
- Longquan Industrial Innovation Research Institute of Zhejiang University（浙江大学龙泉产业创新研究院）
- University of Science and Technology of China（中国科学技术大学）
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