Shot noise in a strange metal

• 成果类型: Article
• 署名作者: Chen, Liyang; Lowder, Dale T.; Bakali, Emine; Andrews, Aaron Maxwell; Schrenk, Werner; Waas, Monika; Svagera, Robert; Eguchi, Gaku; Prochaska, Lukas; Wang, Yiming; Setty, Chandan; Sur, Shouvik; Si, Qimiao; Paschen, Silke; Natelson, Douglas
• 署名单位: Rice University; Rice University; Technische Universitat Wien; Technische Universitat Wien; Technische Universitat Wien; Rice University; Rice University
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-11469
• DOI: 10.1126/science.abq6100
• 发表日期: 2023-11-24
• 页码: 907-911
• 关键词: heavy; superconductor; temperature; suppression; SCATTERING; state

摘要

S trange-metal behavior has been observed in materials ranging from high-temperature superconductors to heavy fermion metals. In conventional metals, current is carried by quasiparticles; although it has been suggested that quasiparticles are absent in strange metals, direct experimental evidence is lacking. We measured shot noise to probe the granularity of the current-carrying excitations in nanowires of the heavy fermion strange metal YbRh2Si2. When compared with conventional metals, shot noise in these nanowires is strongly suppressed. This suppression cannot be attributed to either electron-phonon or electron-electron interactions in a Fermi liquid, which suggests that the current is not carried by well-defined quasiparticles in the strange-metal regime that we probed. Our work sets the stage for similar studies of other strange metals.