Topological surface states and flat bands in the kagome superconductor CsV3Sb5

• 作者: Yong Hu Samuel M.L.Teicher Brenden R.Ortiz Yang Luo Shuting Peng Linwei Huai Junzhang Ma Nicholas C.Plumb Stephen D.Wilson Junfeng He Ming Shi
• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2022,（5）
• 所属期刊栏目: ARTICLES
• 页码范围: 495-500
• 页数: 6页
• 语种: 英文

摘要

Exotic quantum phenomena may appear in material systems with multiple orders or phases,where the mutual interactions can give rise to new physics beyond that of each component.Here,we report spec-troscopic evidence for a unique combination of topology and correlation effects in the kagome supercon-ductor CsV3Sbs.Topologically nontrivial surface states are observed near the Fermi energy (EF),indicating that the topological physics may be active upon entering the superconducting state.Flat bands are observed,suggesting that electron correlation effects are also at play in this system.Our results reveal the peculiar electronic structure of CsV3Sb5,which holds the potential for realizing Majorana zero modes and anomalous superconducting states in kagome lattices.They also establish CsV3Sb5 as a unique plat-form for exploring the interactions between the charge order,topology,correlation effects and superconductivity.