The cascade of electronic phases in CsV3Sb5 raises the prospect to disentangle their mutual interactions in a clean, strongly interacting Kagome lattice. When the Kagome planes are stacked into a crystal, its electronic dimensionality encodes how much of the Kagome physics and its topological aspects survive. The layered structure of CsV3Sb5 reflects in Brillouin-zone-sized quasi-2D Fermi surfaces and a significant transport anisotropy. Yet here we demonstrate that CsV3Sb5 is a three-dimensional metal within the charge-density-wave (CDW) state. Small 3D pockets play a crucial role in its low-temperature magneto- and quantum transport. Their emergence at TCDW∼93 K results in an anomalous sudden increase of the in-plane magnetoresistance by 4 orders of magnitude. The presence of these 3D pockets is further confirmed by quantum oscillations under in-plane magnetic fields - demonstrating their closed nature. These results emphasize the impact of interlayer coupling on the Kagome physics in 3D materials.
@article{arxiv.2201.07780,
title = {3D Fermi surfaces from charge order in layered CsV$_3$Sb$_5$},
author = {Xiangwei Huang and Chunyu Guo and Carsten Putzke and Yan Sun and Maia G. Vergniory and Ion Errea and Martin Gutierrez-Amigo and Dong Chen and Claudia Felser and Philip J. W. Moll},
journal= {arXiv preprint arXiv:2201.07780},
year = {2022}
}