Switchable chiral transport in charge-ordered kagome metal CsV3Sb5

Chunyu Guo (), Carsten Putzke, Sofia Konyzheva, Xiangwei Huang, Martin Gutierrez-Amigo, Ion Errea, Dong Chen, Maia G. Vergniory, Claudia Felser, Mark H. Fischer (), Titus Neupert () and Philip J. W. Moll ()
Additional contact information
Chunyu Guo: École Polytechnique Fédérale de Lausanne (EPFL)
Carsten Putzke: Max Planck Institute for the Structure and Dynamics of Matter
Sofia Konyzheva: École Polytechnique Fédérale de Lausanne (EPFL)
Xiangwei Huang: École Polytechnique Fédérale de Lausanne (EPFL)
Martin Gutierrez-Amigo: Centro de Física de Materiales (CSIC-UPV/EHU)
Ion Errea: Centro de Física de Materiales (CSIC-UPV/EHU)
Dong Chen: Max Planck Institute for Chemical Physics of Solids
Maia G. Vergniory: Donostia International Physics Center
Claudia Felser: Max Planck Institute for Chemical Physics of Solids
Mark H. Fischer: University of Zürich
Titus Neupert: University of Zürich
Philip J. W. Moll: École Polytechnique Fédérale de Lausanne (EPFL)

Nature, 2022, vol. 611, issue 7936, 461-466

Abstract: Abstract When electric conductors differ from their mirror image, unusual chiral transport coefficients appear that are forbidden in achiral metals, such as a non-linear electric response known as electronic magnetochiral anisotropy (eMChA)1–6. Although chiral transport signatures are allowed by symmetry in many conductors without a centre of inversion, they reach appreciable levels only in rare cases in which an exceptionally strong chiral coupling to the itinerant electrons is present. So far, observations of chiral transport have been limited to materials in which the atomic positions strongly break mirror symmetries. Here, we report chiral transport in the centrosymmetric layered kagome metal CsV3Sb5 observed via second-harmonic generation under an in-plane magnetic field. The eMChA signal becomes significant only at temperatures below $${T}^{{\prime} }\approx $$ T ′ ≈ 35 K, deep within the charge-ordered state of CsV3Sb5 (TCDW ≈ 94 K). This temperature dependence reveals a direct correspondence between electronic chirality, unidirectional charge order7 and spontaneous time-reversal symmetry breaking due to putative orbital loop currents8–10. We show that the chirality is set by the out-of-plane field component and that a transition from left- to right-handed transport can be induced by changing the field sign. CsV3Sb5 is the first material in which strong chiral transport can be controlled and switched by small magnetic field changes, in stark contrast to structurally chiral materials, which is a prerequisite for applications in chiral electronics.

Date: 2022
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DOI: 10.1038/s41586-022-05127-9

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