The de Haas-van Alphen quantum oscillations in the kagome metal RbTi3Bi5

TL;DR

This study investigates the topological properties of RbTi3Bi5 using de Haas-van Alphen oscillations, revealing a 2D Fermi pocket with a zero Berry phase, indicating potential for exotic topological states.

Contribution

It provides detailed experimental and theoretical analysis of RbTi3Bi5's Fermi surface and band structure, highlighting its nontrivial topological features and differences from related materials.

Findings

Identification of a 2D Fermi pocket with light-effective mass

Observation of zero Berry phase in RbTi3Bi5

Contrast with CsTi3Bi5 indicating different topological properties

Abstract

Kagome system usually attracts great interest in condensed matter physics due to its unique structure hosting various exotic states such as superconductivity (SC), charge density wave (CDW), and nontrivial topological states. Topological semimetal RbTi3Bi5 consisting of the kagome layer of Ti shares a similar crystal structure to topological correlated materials AV3Sb5 (A = K, Rb, Cs) but with the absence of CDW and SC. Systematic de Haas-van Alphen (dHvA) oscillation measurements are performed on the single crystals of RbTi3Bi5 to pursue nontrivial topological physics and exotic states. Combining with theoretical calculations, detailed Fermi surface topology and band structure are investigated. A two-dimensional (2D) Fermi pocket \b{eta} is revealed with a light-effective mass in consistent with the semimetal predictions. Landau Fan of RbTi3Bi5 reveals a zero Berry phase for the \b{eta} oscillation in contrast to that of CsTi3Bi5. These results suggest the kagome RbTi3Bi5 is a good candidate to explore nontrivial topological exotic states and topological correlated physics.