Related Experiment Video
Updated: Aug 16, 2025

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
Topological surface states and flat bands in the kagome superconductor CsV3Sb5
Yong Hu1, Samuel M L Teicher2, Brenden R Ortiz2
1Department of Physics and CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, University of Science and Technology of China, Hefei 230026, China; Swiss Light Source, Paul Scherrer Institute, Villigen PSI CH-5232, Switzerland.
Abstract:
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 spectroscopic evidence for a unique combination of topology and correlation effects in the kagome superconductor CsV3Sb5. 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 platform for exploring the interactions between the charge order, topology, correlation effects and superconductivity.
Related Concept Videos
Equipotential Surfaces and Conductors
Types Of Superconductors
Band Theory
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
Electric Field at the Surface of a Conductor
In the 19th century, Michael Faraday conducted the famous ice pail experiment to prove that the charges always reside on the surface of a conductor. The experimental set-up consists of a conducting uncharged container mounted on an insulating stand. The outer surface of the container is...
Superconductor
Semiconductors
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...

