Unconventional Optical Rotation in the Charge Ordered State of Kagome Metal CsV3Sb5

Abstract

Kagome metals AV3Sb5 (A = K, Cs, Rb) provide a rich platform for intertwined orders, where evidence for time-reversal symmetry breaking, likely due to the long-sought loop currents, has emerged in STM and muon spin relaxation experiments. An isotropic component in the spontaneous optical rotation has also been reported, and it was interpreted as the magneto-optic Kerr effect arising from time-reversal symmetry breaking. Intriguingly, the observed rotations differ by five orders of magnitude between different wavelengths and samples, suggesting more intricate physics. Here we report optical rotation and polar Kerr measurements in CsV3Sb5 crystals at the same wavelength. We observe large isotropic components of 1 milliradian in the optical rotation that do not respond to applied magnetic fields but flip sign between samples, while the spontaneous Kerr signal is less than 20 nanoradian. Our results prove unambiguously that the reported isotropic rotation is not related to time-reversal symmetry breaking but instead indicates a new intertwined order that onsets at the same temperature.

15 pages, 8 figures, submitted version

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Cited by in corpus (23)

• Superconducting diode effect and interference patterns in Kagome CsV3Sb5
• Emergent superconductivity and pair density wave at antiphase boundaries of charge density wave order in kagome metals
• Phenomenology of bond and flux orders in kagome metals
• Phonon collapse and anharmonic melting of the 3D charge-density wave in kagome metals
• Large Fermi surface in pristine kagome metal CsV${}_3$Sb${}_5$ and enhanced quasiparticle effective masses
• Resolving the discrepancy between MOKE measurements at 1550-nm wavelength on Kagome Metal CsV3Sb5
• Emergence of Quantum Confinement in Topological Kagome Superconductor CsV${}_3$Sb${}_5$ family
• Electronic structure of $A$V${}_3$Sb${}_5$ kagome metals
• Quantifying magnetic field driven lattice distortions in kagome metals at the femto-scale using scanning tunneling microscopy
• Revealing Rotational Symmetry Breaking Charge-density Wave Order in Kagome Superconductor (Rb, K)V${}_3$Sb${}_5$ by Ultrafast Pump-probe Experiments
• Broken symmetries associated with a Kagome chiral charge order
• Impact of Charge Density Waves on Superconductivity and Topological Properties in AV${}_3$Sb${}_5$ Kagome Superconductors
• Discovery of an Intermediate Nematic State in a Bilayer Kagome Metal ScV6Sn6
• Constraints on the orbital flux phase in $A$V${}_3$Sb${}_5$ from polar Kerr effect
• Unveiling the nature of electronic transitions in RbV${}_3$Sb${}_5$ with Avoided Level Crossing $\mu$SR
• Magnetoresistance hysteresis in the superconduting state of Kagome CsV${}_3$Sb${}_5$
• Spin-glass state in nickelate superconductors
• Nanoscale strain manipulation of smectic susceptibility in kagome superconductors
• Loop-current order through the kagome looking glass
• Magnetic field-induced momentum-dependent symmetry breaking in a kagome superconductor
• Orbital altermagnetism on the kagome lattice and possible application to $A$V${}_3$Sb${}_5$
• Topological pair density waves in kagome superconductors
• Electronic and structural properties of Rh- and Pd-based kagome layered shandites from first principles