2021/04/26 by Yong Hu, Samuel M. L. Teicher, Brenden R. Ortiz +10
Physics and Astronomy · #Advanced Condensed Matter Physics #Charge (physics) #Condensed matter physics #Fermi surface #MAJORANA #Order (exchange) #Physics #Quantum many-body systems #Quantum mechanics #Superconductivity #Topological Materials and Phenomena #Topology (electrical circuits) #cond-mat.mtrl-sci #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1016/j.scib.2021.11.026
published as Science Bulletin, 67(5):495-500 (2022)
arxiv created 2021/04/26 · openalex publication_date 2021/11/30 · openalex created_date 2021/12/06 · arxiv updated 2022/03/02 · openalex updated_date 2026/08/06
The diversity of emergent phenomena in quantum materials often arises from the interplay between different physical energy scales or broken symmetries. Cooperative interactions among them are rare; however, when they do occur, they often stabilize fundamentally new ground states or phase behaviors. For instance, a pair density wave can form when the superconducting order parameter borrows spatial periodical variation from charge order; a topological superconductor can arise when topologically nontrivial electronic states proximitize with or participate in the formation of the superconducting condensate. Here, we report spectroscopic evidence for a unique synergy of topology and correlation effects in the kagome superconductor CsV3Sb5 - one where topologically nontrivial surface states are pushed below the Fermi energy (EF) by charge order, making the topological physics active near EF upon entering the superconducting state. Flat bands are observed, indicating 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 platform for exploring the cooperation between the charge order, topology, correlation effects and superconductivity.