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arXiv · 2201.07780

3D Fermi surfaces from charge order in layered CsV$_3$Sb$_5$

Xiangwei Huang·Chunyu Guo·Carsten Putzke·Yan Sun·Maia G. Vergniory·Ion Errea·Martin Gutierrez-Amigo·Dong Chen·Claudia Felser·Philip J. W. Moll
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Abstract

The cascade of electronic phases in CsV$_3$Sb$_5$ 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 CsV$_3$Sb$_5$ reflects in Brillouin-zone-sized quasi-2D Fermi surfaces and a significant transport anisotropy. Yet here we demonstrate that CsV$_3$Sb$_5$ 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 $T_{CDW}\sim 93$ 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.

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Xiangwei Huang, Chunyu Guo, Carsten Putzke, Yan Sun, Maia G. Vergniory, Ion Errea, Martin Gutierrez-Amigo, Dong Chen, Claudia Felser, Philip J. W. Moll. 2022-01-19. 3D Fermi surfaces from charge order in layered CsV$_3$Sb$_5$. https://doi.org/10.1103/physrevb.106.064510

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