Uncovering hidden Fermi surface instabilities through visualizing unconventional quasiparticle interference in CeTe3

作     者：B. R. M. Smith Y. Fujisawa P. Wu T. Nakamura N. Tomoda S. Kuniyoshi D. Ueta R. Kobayashi R. Okuma K. Arai K. Kuroda C.-H. Hsu G. Chang C.-Y. Huang H. Lin Z. Y. Wang T. Kondo Y. Okada 

作者机构：Quantum Materials Science Unit Research Institute for Synchrotron Radiation Science Department of Physics and Chinese Academy of Sciences Key Laboratory of Strongly-Coupled Quantum Matter Physics Faculty of Science Institute of Materials Structure Science Institute for Solid State Physics (ISSP) Graduate School of Advanced Science and Engineering International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SCKM Division of Physics and Applied Physics School of Physical and Mathematical Sciences Institute of Physics Trans-scale Quantum Science Institute 

出 版 物：《Physical Review Materials》 (Physic. Rev. Mat.)

年 卷 期：2024年第8卷第10期

页      面：104004页

核心收录：

基　　金：Asahi Glass Foundation, AGF Murata Science and Education Foundation NTU-SUG Mitsubishi Foundation Ministry of Education - Singapore, MOE Quantum Material Science Unit Okinawa Institute of Science and Technology Graduate University, OIST Japan Society for the Promotion of Science, JSPS, (JP24K17017, JP23K17351, JP21H04439) Japan Society for the Promotion of Science, JSPS Agency for Science, Technology and Research, A*STAR, (M23M6c0100) Agency for Science, Technology and Research, A*STAR National Research Foundation Singapore, NRF, (NRF-NRFF13-2021-0010) National Research Foundation Singapore, NRF Ministry of the Environment, Government of Japan, MOE, (MOE-T2EP50222-0014) Ministry of the Environment, Government of Japan, MOE 

主　　题：Charge density waves Two-dimensional electron system Scanning tunneling microscopy 

摘      要：The charge density wave (CDW) state is a widespread phenomenon in low-dimensional metals/semimetals. The spectral weight of the associated folded bands (shadow bands) can be an intriguing trigger leading to additional Fermi surface instability and unexplored phase transitions. The rare earth tri-telluride CeTe3 exhibits a single CDW stabilized below ∼400K and antiferromagnetism below ∼3K. The distinct periodicities between the Te-square net, the CeTe block layer, and the CDW give rise to rich shadow band formations. In this work, we reveal the predominant scattering between the original and shadow bands at 4 K, with the scattering within the original bands being relatively suppressed at Fermi energy. This unconventional quasiparticle scattering collectively underscores the vital role of the shadow bands spectral weight and the exotic hidden matrix element effect, which are crucial for controlling electronic properties in this system. Furthermore, our finding points to the existence of rich and unexplored Fermi surface instabilities, which potentially play a role in controlling the nature of long-range antiferromagnetism at lower temperatures in the presence of finite charge-spin interaction.