Topology of triple-point metals

• 来源期刊: 中国物理B（英文版）
• 关键词: topological metals topological phonons electronic structure thermoelectrics
• 年，卷（期）: 2019,（7）
• 页码范围: 57-76
• 页数: 20页
• 语种: 英文
• DOI: 10.1088/1674-1056/28/7/077303

摘要

We discuss and illustrate the appearance of topological fermions and bosons in triple-point metals where a band crossing of three electronic bands occurs close to the Fermi level. Topological bosons appear in the phonon spectrum of certain triple-point metals, depending on the mass of atoms that form the binary triple-point metal. We first provide a classification of possible triple-point electronic topological phases possible in crystalline compounds and discuss the consequences of these topological phases, seen in Fermi arcs, topological Lifshitz transitions, and transport anomalies. Then we show how the topological phase of phonon modes can be extracted and proven for relevant compounds. Finally, we show how the interplay of electronic and phononic topologies in triple-point metals puts these metallic materials into the list of the most efficient metallic thermoelectrics known to date.