CMD30 FisMat2023 - Submission - View

Abstract title: Phonon Fluctuation of CDW in AV3Sb5 Kagome
Submitting author: Stefan Enzner
Affiliation: CT.QMAT, Würzburg-Dresden Cluster of Excellence and AG Sangiovanni, Institut für Theoretische Physik und Astrophysik, Universitä
Affiliation Address: Sanderring 2, 97070 Würzburg
Country: Germany
Other authors and affiliations: Berges Jan (U Bremen Excellence Chair, Bremen Center for Computational Materials Science and MAPEX Center for Materials and Processes, Universität Bremen), Di Sante Domenico (Department of Physics and Astronomy, University of Bologna and Center for Computational Quantum Physics, Flatiron Institute), Sangiovanni Giorgio (CT.QMAT, Würzburg-Dresden Cluster of Excellence and AG Sangiovanni, Institut für Theoretische Physik und Astrophysik, Universität Würzburg), Wehling Tim (I. Institute of Theoretical Physics, University of Hamburg and The Hamburg Centre for Ultrafast Imaging​)
Abstract
Recently, the kagome superconductor family AV3Sb5 (A = K, Rb, Cs) has been heavily investigated due to its interesting lattice and the occurrence of a charge density wave (CDW). Especially, the origin of the instability and its connection to superconductivity is intensely discussed. Among the most common proposed explanations for the CDW is Fermi surface nesting, influence of van-Hove-singularities and matrix element effects [1,2,3]. However, a clear cut identification is still outstanding.
By utilizing phonon fluctuation diagnostics [4] we try to pinpoint the electronic processes behind phonon softening​. This allows us to disentangle fermiology and matrix-element effects and thereby enhance the understanding of the CDW origin. [1] M. Kang, et al., Nat. Phys. 18, 301–308 (2022)
[2] X. Wu, et al., Phys. Rev. Lett. 127, 177001
[3] H. Luo, et al., Nat Commun 13, 273 (2022)
[4] J. Berges et al., Phys. Rev. B 101, 155107 (2020)​