Fermi Surface Mapping and the Nature of Charge-Density-Wave Order in the Kagome Superconductor CsV3Sb5

By B. Ortiz, S. Teicher, L. Kautzsch, P. Sarte, N. Ratcliff, J. Harter, J. Ruff, R. Seshadri, Stephen D. Wilson. Physical Review X, 2021

230 citations recorded by the source corpus.

The recently discovered family of A V 3 Sb 5 ( A : K, Rb Cs) kagome metals possess a unique com-bination of nontrivial band topology, superconducting ground states, and signatures of electron correlations manifest via competing charge density wave order. Little is understood regarding the nature of the charge density wave (CDW) instability inherent to these compounds and the potential correlation with the onset of a large anomalous Hall response. To understand the impact of the CDW order on the electronic structure in these systems, we present quantum oscillation measurements on single crystals of CsV 3 Sb 5 . Our data provide direct evidence that the CDW invokes a substantial reconstruction of the Fermi surface pockets associated with the vanadium orbitals and the kagome lattice framework. In conjunction with density functional theory modeling, we are able to identify split oscillation frequencies originating from reconstructed pockets built from vanadium orbitals and Dirac-like bands. Complementary diﬀraction measurements are further able to demonstrate that the CDW instability has a correlated phasing of distortions between neighboring V 3 Sb 5 planes, and the average structure in the CDW state is proposed. These results provide critical insights into the underlying CDW instability in A V 3 Sb 5 kagome metals and support minimal models of CDW order arising from within the vanadium-based kagome lattice.

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics

View Paper: https://www.semanticscholar.org/paper/c0f5083a9e018dd56c14fb430d15c6fa58693964

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Citations in the corpus

Quantum states and intertwining phases in kagome materials (2023, unknown): “However, the 2 × 2 × 4 order at low temperature 139,140 , the 2 × 2 × 1 (ref.”
Theory of the charge density wave in AV3Sb5 kagome metals (2021, methodology): “Meanwhile, the coupling between Mi and Li allows for coupled CDW phases that do break the sixfold rotational symmetry and double the unit cell in all directions, being consistent with experimental observations [23,27,28].”
Three-state nematicity and magneto-optical Kerr effect in the charge density waves in kagome superconductors (2022, background): “Our results add strong constraints on interpreting other macroscopic measurements including photo-emission, x-ray and optical spectroscopy [29, 41–44 As predicted in theoretical works [9, 10, 12, 51–53], the interactions between saddle points in the kagome lattice lead to various competing orders…”