High Resolution Polar Kerr Effect Studies of 
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: Tests for Time-Reversal Symmetry Breaking below the Charge-Order Transition

Saykin, David R.; Farhang, Camron; Kountz, Erik D.; Chen, Dong; Ortiz, Brenden R.; Shekhar, Chandra; Felser, Claudia; Wilson, Stephen D.; Thomale, Ronny; Xia, Jing; Kapitulnik, A.

doi:10.1103/physrevlett.131.016901

Cited by 37 publications

(6 citation statements)

References 54 publications

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“…Beyond this, an impressive set of experiments has demonstrated that an additional phenomenon is happening in this material, often associated with an onset temperature of , yet the nature and physical influences are under heavy debate, fuelled by openly contradictory experimental results. These experiments include signatures of time-reversal symmetry (TRS) breaking 27 – 31 and absence thereof 32 , 33 ; electronic nematicity 34 – 38 and absence thereof 39 , 40 ; and tuneable chirality 41 – 43 and absence thereof 44 .…”

Section: Mainmentioning

confidence: 99%

Correlated order at the tipping point in the kagome metal CsV3Sb5

Guo,

Wagner,

Putzke

et al. 2024

Nat. Phys.

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Spontaneously broken symmetries are at the heart of many phenomena of quantum matter and physics more generally. However, determining the exact symmetries that are broken can be challenging due to imperfections such as strain, in particular when multiple electronic orders are competing. This is exemplified by charge order in some kagome systems, where evidence of nematicity and flux order from orbital currents remains inconclusive due to contradictory measurements. Here we clarify this controversy by fabricating highly symmetric samples of a member of this family, CsV3Sb5, and measuring their transport properties. We find that a measurable anisotropy is absent at any temperature in the unperturbed material. However, a pronounced in-plane transport anisotropy appears when either weak magnetic fields or strains are present. A symmetry analysis indicates that a perpendicular magnetic field can indeed lead to in-plane anisotropy by inducing a flux order coexisting with more conventional bond order. Our results provide a unifying picture for the controversial charge order in kagome metals and highlight the need for materials control at the microscopic scale in the identification of broken symmetries.

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Section: Mainmentioning

confidence: 99%

Correlated order at the tipping point in the kagome metal CsV3Sb5

Guo,

Wagner,

Putzke

et al. 2024

Nat. Phys.

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“…Pioneering muon spin rotation measurements on this family have reported the evidence of TRSB chiral flux phase 18,55 but controversies remain. On the one hand, there are conflicting experimental results concerning the concurrence of TRSB 18,24,25,56 and the chirality of the 2 × 2 CDW 3,22,23,57 , rendering the nature of CDW and its relationship with chiral flux phase unclear. On the other hand, no indication of chiral flux current can be found from spin-polarized STM measurement 22 .…”

Section: Discussionmentioning

confidence: 99%

“…Recently, signatures of current flux, especially the resultant time-reversal symmetry breaking (TRSB), have been observed by probes such as scanning tunnelling microscopy (STM) 3 , muon spin relaxation 18,19 , magneto-optical Kerr effect 20 , and electronic magnetochiral anisotropy 21 . However, there are also other experiments reporting sampledependent signatures of TRSB or even negative evidence [22][23][24][25] .…”

mentioning

confidence: 99%

Emergence of quantum confinement in topological kagome superconductor CsV3Sb5

Cai,

Wang,

Hao

et al. 2024

Commun Mater

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Quantum confinement is a restriction on the motion of electrons in a material to specific region, resulting in discrete energy levels rather than continuous energy bands. In certain materials, quantum confinement could dramatically reshape the electronic structure and properties of the surface with respect to the bulk. Here, in the recently discovered kagome superconductors CsV3Sb5, we unveil the dominant role of quantum confinement in determining their surface electronic structure. Combining angle-resolved photoemission spectroscopy (ARPES) measurement and density-functional theory simulation, we report the observations of two-dimensional quantum well states due to the confinement of bulk electron pocket and Dirac cone to the nearly isolated surface layer. The theoretical calculations on the slab model also suggest that the ARPES observed spectra are almost entirely contributed by the top two layers. Our results not only explain the disagreement of band structures between the recent experiments and calculations, but also suggest an equally important role played by quantum confinement, together with strong correlation and band topology, in shaping the electronic properties of this material.

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“…Other indications of timereversal symmetry breaking are the observation of an increase in muon spin relaxation below T CDW 58, 59 and magneto-optical Kerr effect 60 . In the case of the latter experiment, there remains debate as an alternative experiment found no discernible Kerr effect 61 . Since long-range magnetic order is absent in the 135 compounds, time-reversal symmetry breaking is explained in terms of loop-current order in the CDW state 3,60 .…”

Section: Anomalous Hall-like Behaviormentioning

confidence: 98%

Universal sublinear resistivity in vanadium kagome materials hosting charge density waves

Mozaffari

Mandrus

Meier

et al. 2023

Preprint

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The recent discovery of a charge density (CDW) state in ScV6Sn6 at TCDW = 91 K offers new opportunities to understand the origins of electronic instabilities in topological kagome systems. By comparing to the isostructural non-CDW compound LuV6Sn6, we unravel interesting electrical transport properties in ScV6Sn6, above and below the charge ordering temperature. We observed that by applying a magnetic field along the a axis, the temperature behavior of the longitudinal resistivity in ScV6Sn6 changes from metal-like to insulator-like above the CDW transition. We show that in the charge ordered state ScV6Sn6 follows the Fermi liquid behavior while above that, it transforms into a non-Fermi liquid phase in which the resistivity varies sublinearly over a broad temperature range. The sublinear resistivity, which scales by T3/5 is a common feature among other vanadium-containing kagome compounds exhibiting CDW states such as KV3Sb5, RbV3Sb5, and CsV3Sb5. By contrast, the non-Fermi liquid behavior does not occur in LuV6Sn6. We explain the T3/5 universal scaling behavior from the Coulomb scattering between Dirac electrons and Van Hove singularities; common features in the electronic structure of kagome materials. Finally, we show anomalous Hall-like behavior in ScV6Sn6 below TCDW, which is absent in the Lu compound. Comparing the transport properties of ScV6Sn6 and LuV6Sn6 is valuable to highlight the impacts of the unusual CDW in the Sc compound.

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High Resolution Polar Kerr Effect Studies of CsV3Sb5 : Tests for Time-Reversal Symmetry Breaking below the Charge-Order Transition

Cited by 37 publications

References 54 publications

Correlated order at the tipping point in the kagome metal CsV3Sb5

Correlated order at the tipping point in the kagome metal CsV3Sb5

Emergence of quantum confinement in topological kagome superconductor CsV3Sb5

Universal sublinear resistivity in vanadium kagome materials hosting charge density waves

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